[RFC] Clarification on formatting for bangs (!)

It seems to me that 
> Add a single space around operators

would mean using the practice on the bang operator as well; as discussed in [this thread](https://github.com/php-fig/fig-standards/issues/102), there is somewhat of a conflict--so this may not be the way to go. If the PSR could be amended, then this change would make sense.

Author: bryanagee

contributing/code/standards.rst

@@ -79,14 +79,22 @@ example containing most features described below:
 
             throw new \RuntimeException(sprintf('Unrecognized dummy option "%s"', $dummy));
         }
+        
+        private function reverseBoolean($value = null)
+        {
+            if ( ! isset($value)) {
+                return;
+            }
+            return ! $value;
+        }
     }
 
 Structure
 ---------
 
 * Add a single space after each comma delimiter;
 
-* Add a single space around operators (``==``, ``&&``, ...);
+* Add a single space around operators (``==``, ``&&``, ``!``, ...);
 
 * Add a comma after each array item in a multi-line array, even after the
   last one;