Input source map into minified source

Author: STRML

script/build

@@ -5,4 +5,5 @@ node_modules/.bin/uglifyjs dist/react-draggable.js \
   --output dist/react-draggable.min.js \
   --source-map dist/react-draggable.min.map \
   --source-map-url react-draggable.min.map \
-  --compress warnings=false
+  --in-source-map dist/react-draggable.map \
+  --compress warnings=false