Bump python protobuf dependency to 3.0.0
diff --git a/requirements.txt b/requirements.txt
index 0ec0e75..bf87de0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,6 @@
 cython>=0.23
 enum34>=1.0.4
 futures>=2.2.0
-protobuf>=3.0.0a3
+protobuf>=3.0.0
 six>=1.10
-wheel>=0.29
\ No newline at end of file
+wheel>=0.29