Generalize the gitignore rule for dotenv files (#12)

Author: tamara-at-hubspot

projects/getting-started-template/.gitignore

@@ -69,8 +69,7 @@ typings/
 .yarn-integrity
 
 # dotenv environment variables file
-.env
-.env.test
+.env*
 
 # parcel-bundler cache (https://parceljs.org/)
 .cache