Fixing frontend.

Author: John Vilk

README.md

@@ -183,6 +183,10 @@ source maps generated from multiple source files, which is intended to be useful
 Currently, `merge-source-maps` does not support this field, and will throw an error.
 Feel free to open an issue if this limitation is inhibiting your use of `merge-source-maps`.
 
+## Building
+
+To build `merge-source-maps` from source, simply run `npm install`.
+
 ## What about {gulp,jake,broccoli}?
 
 Do you use a different build system?

bin/merge-source-maps.ts

@@ -24,7 +24,7 @@ const opts: ISourceMapMergerConfig = {
 };
 
 if (args._.length > 0) {
-  mergeSourceMaps.merge(args._, opts);
+  mergeSourceMaps.merge(args._.map((f: string) => { return { src: f, dest: f } }), opts);
 } else {
   parser.showHelp();
 }