Update protobuf versions (#1356)

Fixes #1355

Author: ocelotl

dev-requirements.txt

@@ -8,3 +8,7 @@ sphinx-rtd-theme~=0.4
 sphinx-autodoc-typehints~=1.10.2
 pytest!=5.2.3
 pytest-cov>=2.8
+readme-renderer~=24.0
+grpcio-tools==1.29.0
+mypy-protobuf>=1.23
+protobuf>=3.13.0

instrumentation/opentelemetry-instrumentation-grpc/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+- Update protobuf versions
+  ([#1356](https://github.com/open-telemetry/opentelemetry-python/pull/1356))
+
 ## Version 0.15b0
 
 Released 2020-11-02

instrumentation/opentelemetry-instrumentation-grpc/setup.cfg

@@ -47,7 +47,7 @@ install_requires =
 test =
     opentelemetry-test == 0.16.dev0
     opentelemetry-sdk == 0.16.dev0
-    protobuf == 3.12.2
+    protobuf >= 3.13.0
 
 [options.packages.find]
 where = src