docs(github): update issue template

Author: Kent C. Dodds

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,18 @@
+##########################################################
+#                                                        #
+#                                                        #
+#    This project is unlikely to have any active         #
+#    development due to webpack 2.2.0 having built-in    #
+#    support for validation. Please upgrade webpack      #
+#    and uninstall webpack-validator                     #
+#                                                        #
+#                                                        #
+##########################################################
+
+If you _must_ file an issue, at least please include the
+version of webpack you're using and all relevant information.
+
+Note: If you are using webpack 2, your issue will be closed.
+This project does not and will never support webpack 2.
+
+Thanks!