Put facter development dependence in template as well.
diff --git a/templates/grpc.gemspec.template b/templates/grpc.gemspec.template
index 701e1c7..6f8d1fb 100644
--- a/templates/grpc.gemspec.template
+++ b/templates/grpc.gemspec.template
@@ -37,6 +37,7 @@
s.add_dependency 'googleauth', '~> 0.5.1'
s.add_development_dependency 'bundler', '~> 1.9'
+ s.add_development_dependency 'facter', '~> 2.4'
s.add_development_dependency 'logging', '~> 2.0'
s.add_development_dependency 'simplecov', '~> 0.9'
s.add_development_dependency 'rake', '~> 10.4'