build: don't add map files

Author: sgratzl

package.json

@@ -14,7 +14,7 @@
     "lineupjs": "4.6.2"
   },
   "scripts": {
-    "postinstall": "shx mkdir -p inst/htmlwidgets/dist && shx cp -r \"node_modules/lineupjs/build/LineUp*\" \"node_modules/lineupjs/build/*.eot\" \"node_modules/lineupjs/build/*.svg\" \"node_modules/lineupjs/build/*.ttf\"  \"node_modules/lineupjs/build/*.woff\" inst/htmlwidgets/dist"
+    "postinstall": "shx rm -f inst/htmlwidgets/dist/* && shx mkdir -p inst/htmlwidgets/dist && shx cp -r \"node_modules/lineupjs/build/LineUp*\" \"node_modules/lineupjs/build/*.eot\" \"node_modules/lineupjs/build/*.svg\" \"node_modules/lineupjs/build/*.ttf\"  \"node_modules/lineupjs/build/*.woff\" inst/htmlwidgets/dist && shx rm inst/htmlwidgets/dist/*.map"
   },
   "devDependencies": {
     "shx": "^0.3.4"