chore: use nox and release-please; drop 3.4 (#852)



Co-authored-by: Kamil BreguĊ‚a <mik-laj@users.noreply.github.com>
Co-authored-by: Christopher Wilcox <crwilcox@google.com>
diff --git a/synth.metadata b/synth.metadata
new file mode 100644
index 0000000..d06a0f1
--- /dev/null
+++ b/synth.metadata
@@ -0,0 +1,12 @@
+{
+  "updateTime": "2020-03-30T20:47:31.469660Z",
+  "sources": [
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "f5e8c88d9870d8aa4eb43fa0b39f07e02bfbe4df"
+      }
+    }
+  ]
+}
\ No newline at end of file