Remove coverage directory from the repo.

Author: brendandburns

.gitignore

@@ -1,10 +1,11 @@
 dist
 node_modules
-/node-client/src/.gitignore
-/node-client/src/package.json
-/node-client/src/git_push.sh
-/node-client/src/tsconfig.json
-/node-client/src/typings.json
+node-client/src/.gitignore
+node-client/src/package.json
+node-client/src/git_push.sh
+node-client/src/tsconfig.json
+node-client/src/typings.json
+node-client/coverage/*
 .vscode/*
 examples/package-lock.json
 node-client/.nyc_output