diff --git a/go.sum b/go.sum
index 5ed2717..46eb471 100644
--- a/go.sum
+++ b/go.sum
@@ -73,6 +73,8 @@
 contrib.go.opencensus.io/exporter/stackdriver v0.12.9/go.mod h1:XyyafDnFOsqoxHJgTFycKZMrRUrPThLh2iYTJF6uoO0=
 contrib.go.opencensus.io/exporter/stackdriver v0.13.0 h1:Jaz7WbqjtfoCPa1KbfisCX+P5aM3DizEY9pQMU0oAQo=
 contrib.go.opencensus.io/exporter/stackdriver v0.13.0/go.mod h1:z2tyTZtPmQ2HvWH4cOmVDgtY+1lomfKdbLnkJvZdc8c=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.1 h1:RX9W6FelAqTVnBi/bRXJLXr9n18v4QkQwZYIdnNS51I=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.1/go.mod h1:z2tyTZtPmQ2HvWH4cOmVDgtY+1lomfKdbLnkJvZdc8c=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/99designs/goodies v0.0.0-20140916053233-ec7f410f2ff2/go.mod h1:cbC1BMQYOqZ70I8LEvH53q53MzD33COOamPrxo0Y3Wk=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
@@ -174,6 +176,8 @@
 github.com/aws/aws-sdk-go v1.29.34/go.mod h1:1KvfttTE3SPKMpo8g2c6jL3ZKfXtFvKscTgahTma5Xg=
 github.com/aws/aws-sdk-go v1.30.0 h1:7NDwnnQrI1Ivk0bXLzMmuX5ozzOwteHOsAs4druW7gI=
 github.com/aws/aws-sdk-go v1.30.0/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
+github.com/aws/aws-sdk-go v1.30.2 h1:0vuroAsbPwVbP91MMaUmFLnrQcFBhmjQnnXaH1kcnPw=
+github.com/aws/aws-sdk-go v1.30.2/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
@@ -372,6 +376,8 @@
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 github.com/google/licenseclassifier v0.0.0-20200108231022-9dfa8d8474eb h1:/3Y/s7OuY55tCvoMktoMkIWaZFoMBhgOq4FEHQT+gR8=
 github.com/google/licenseclassifier v0.0.0-20200108231022-9dfa8d8474eb/go.mod h1:qsqn2hxC+vURpyBRygGUuinTO42MFRLcsmQ/P8v94+M=
+github.com/google/licenseclassifier v0.0.0-20200402202327-879cb1424de0 h1:OggOMmdI0JLwg1FkOKH9S7fVHF0oEm8PX6S8kAdpOps=
+github.com/google/licenseclassifier v0.0.0-20200402202327-879cb1424de0/go.mod h1:qsqn2hxC+vURpyBRygGUuinTO42MFRLcsmQ/P8v94+M=
 github.com/google/martian v2.1.0+incompatible h1:/CP5g8u/VJHijgedC/Legn3BAbAaWPgecwXBIDzw5no=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
@@ -862,6 +868,10 @@
 go.chromium.org/luci v0.0.0-20200331030153-44e3a25ca700/go.mod h1:MIQewVTLvOvc0UioV0JNqTNO/RspKFS0XEeoKrOxsdM=
 go.chromium.org/luci v0.0.0-20200401031031-05ba3decd1b6 h1:xRp9ybey0IX5l0h7L+UWLAohKR6Zid+5EAjWnJG8IVs=
 go.chromium.org/luci v0.0.0-20200401031031-05ba3decd1b6/go.mod h1:MIQewVTLvOvc0UioV0JNqTNO/RspKFS0XEeoKrOxsdM=
+go.chromium.org/luci v0.0.0-20200402040520-a32783f8f312 h1:vndqEhR32oSP1///0+v3XrFkpn2N0n2BUkKc1VINIBk=
+go.chromium.org/luci v0.0.0-20200402040520-a32783f8f312/go.mod h1:MIQewVTLvOvc0UioV0JNqTNO/RspKFS0XEeoKrOxsdM=
+go.chromium.org/luci v0.0.0-20200403021923-006ff0a2ec2a h1:/Ne2TU5N4lK4ZfA22glUVyj4KdKuUA/VohvQzAnV6Yo=
+go.chromium.org/luci v0.0.0-20200403021923-006ff0a2ec2a/go.mod h1:MIQewVTLvOvc0UioV0JNqTNO/RspKFS0XEeoKrOxsdM=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.mongodb.org/mongo-driver v1.1.0/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
@@ -947,6 +957,8 @@
 go.skia.org/infra v0.0.0-20200328143804-69c3c80327e1/go.mod h1:FzFOFcSMmaKkR7Snw9DJSNWES5HM70WXjbXlmhPbqJg=
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+go.skia.org/infra v0.0.0-20200402112703-95d586d415df h1:TcvA7ph3bLNE10lO/3KvqiMw1v3HUi4By7yY/FP3Mv0=
+go.skia.org/infra v0.0.0-20200402112703-95d586d415df/go.mod h1:JpXR1PDo6+gx1Rb+JOUxa6Jnv5fjMBEOdzikHK+z0nY=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
@@ -1289,6 +1301,10 @@
 golang.org/x/tools v0.0.0-20200331025713-a30bf2db82d4/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8=
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 golang.org/x/tools v0.0.0-20200331202046-9d5940d49312/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20200401192744-099440627f01 h1:ysQJ/fU6laLOZJseIeOqXl6Mo+lw5z6b7QHnmUKjW+k=
+golang.org/x/tools v0.0.0-20200401192744-099440627f01/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20200402223321-bcf690261a44 h1:bMm0eoDiGkM5VfIyKjxDvoflW5GLp7+VCo+60n8F+TE=
+golang.org/x/tools v0.0.0-20200402223321-bcf690261a44/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -1405,6 +1421,10 @@
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+google.golang.org/genproto v0.0.0-20200401122417-09ab7b7031d2 h1:eZsz/292hR170DD4kerBdhgSY46xtPMKK7cni40jBmk=
+google.golang.org/genproto v0.0.0-20200401122417-09ab7b7031d2/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
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 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1 h1:Hz2g2wirWK7H0qIIhGIqRGTuMwTE8HEKFnDZZ7lm9NU=