feat: support Node v6 & Windows

Author: gregberge

.babelrc

@@ -2,7 +2,7 @@
   "presets": [
     ["env", {
       "targets": {
-        "node": "current"
+        "node": "6"
       }
     }]
   ]

src/commands/end.js

@@ -6,7 +6,7 @@ export default program =>
     .description('Go to the end of an exercise')
     .action(async (exercise, options) => {
       console.log('Stashing changes...')
-      await exec(`git stash save "end exercise ${exercise}"`)
+      await exec(`git stash -u`)
       console.log(`Going to the end of exercise ${exercise}`)
       await exec(`git checkout end-exercise-${exercise}`)
       console.log(`Installing dependencies...`)

src/commands/start.js

@@ -6,7 +6,7 @@ export default program =>
     .description('Go to the beginning of an exercise')
     .action(async (exercise, options) => {
       console.log('Stashing changes...')
-      await exec(`git stash save "start exercise ${exercise}"`)
+      await exec(`git stash -u`)
       console.log(`Going to the start of exercise ${exercise}`)
       await exec(`git checkout start-exercise-${exercise}`)
       console.log(`Installing dependencies...`)