Downgrade 'space-unary-ops' in .eslintrc because of eslint/eslint#2764

Author: yannickcr

.eslintrc

@@ -146,7 +146,7 @@
         "space-in-parens": 2,
         "space-infix-ops": 2,
         "space-return-throw-case": 2,
-        "space-unary-ops": 2,
+        "space-unary-ops": 1,
         "spaced-line-comment": 2,
         "wrap-regex": 0,
         // Legacy