Disallow template literal placeholder syntax in regular strings (no-template-curly-in-string)

Fixes: standard/standard#594

Author: feross

eslintrc.json

@@ -104,6 +104,7 @@
     "no-shadow-restricted-names": 2,
     "no-sparse-arrays": 2,
     "no-tabs": 2,
+    "no-template-curly-in-string": 2,
     "no-this-before-super": 2,
     "no-throw-literal": 2,
     "no-trailing-spaces": 2,