chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

yarn.lock

@@ -3808,9 +3808,9 @@ rollup-pluginutils@^2.0.1:
     estree-walker "^0.3.0"
     micromatch "^2.3.11"
 
-rollup@^0.50.0:
-  version "0.50.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.50.0.tgz#4c158f4e780e6cb33ff0dbfc184a52cc58cd5f3b"
+rollup@0.51.0:
+  version "0.51.0"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.51.0.tgz#bee110391dd42a48d61f31804807a80be4a085e5"
 
 rsvp@^3.3.3:
   version "3.6.2"
@@ -4459,7 +4459,7 @@ typedoc-default-themes@^0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/typedoc-default-themes/-/typedoc-default-themes-0.5.0.tgz#6dc2433e78ed8bea8e887a3acde2f31785bd6227"
 
-typedoc@0.9.0:
+typedoc@^0.9.0:
   version "0.9.0"
   resolved "https://registry.yarnpkg.com/typedoc/-/typedoc-0.9.0.tgz#159bff7c7784ce5b91d86f3e4cc8928e62040957"
   dependencies: