Fix invalid escape sequences (#34)
Fix invalid escape sequences (#34)

`\(` and `\)` are invalid escape sequences in Starlark. This used to be silently ignored but now throws an error (see https://github.com/bazelbuild/bazel/commit/73402fa4aa5b9de46c9a4042b75e6fb332ad4a7f).
bazelbuild/rules_gwt,bazelbuild/rules_gwt