Correcting the regex for express param conversion.

* It was working before, but it wasn't written properly.  Should match on [^}]+.
* Learned something new about javascript I.E. + can backtrack.

index.js

@@ -202,7 +202,7 @@ function copy(obj) {
 }
 
 function toExpressParams(part) {
-  return part.replace(/^\{([^\{]+)\}$/, ':$1');
+  return part.replace(/^\{([^\}]+)\}$/, ':$1');
 }
 
 function withNoDuplicates(arr) {