fix typo (#417)

Author: justjavac

lib/resolveOptions.js

@@ -22,14 +22,14 @@ function resolveOptions(options) {
   if (options.decorateRequest) {
     throw new Error(
       'decorateRequest is REMOVED; use proxyReqOptDecorator and' +
-      'proxyReqBodyDecorator instead.  see README.md'
+      ' proxyReqBodyDecorator instead.  see README.md'
     );
   }
 
   if (options.forwardPath || options.forwardPathAsync) {
     console.warn(
       'forwardPath and forwardPathAsync are DEPRECATED' +
-      'and should be replaced with proxyReqPathResolver'
+      ' and should be replaced with proxyReqPathResolver'
     );
   }