Added linux support npm run

bin/elxr

 const spawn = require('child_process').spawn;
 console.dir(process.argv.slice(2))
 
+let npmcmd = (process.platform === 'win32' ? 'npm.cmd' : 'npm')
+let npmrun = (process.platform === 'win32' ? ['run', 'index', '--'] : ['run', 'index_linux', '--'])  
+
 const child = spawn(
-    (process.platform === 'win32' ? 'npm.cmd' : 'npm')    
-    , ['run', 'index', '--'].concat(process.argv.slice(2)), { env : Object.assign({}, process.env, {wd: process.cwd()}), cwd: __dirname });
+    npmcmd    
+    , npmrun.concat(process.argv.slice(2)), { env : Object.assign({}, process.env, {wd: process.cwd()}), cwd: __dirname });
 
 // const child = spawn(
 //         'C:\\Program Files\\Git\\bin\\sh.exe'

package.json

     "test": "echo \"Error: no test specified\" && exit 1",
     "build-elxr": "rollup index.js --format cjs --file elxr.js",
     "build": "rollup -c && rollup index.js --format cjs --file elxr.js",
-    "index": "SET FORCE_COLOR=true && node index"
+    "index": "SET FORCE_COLOR=true && node index",
+    "index_linux": "FORCE_COLOR=true node index"
   },
   "keywords": [],
   "author": "",