Module build failed: Error: [BABEL] .../src/my-command.js: .env is not allowed in preset options
```
$ skpm --version
1.0.14
```

Create a new plugin with `skpm create my-plugin` - the command fails with:
```
Error: Exited with status 1
```

Building the plugin fails with error:

```
$ npm run build

> my-plugin1@0.1.0 build /Users/.../sketch/plugins/my-plugin1
> skpm-build

[1/3] 🖨  Copied src/manifest.json in 2ms
[2/3] ⛏  Copied assets/icon.png
error Error while building ./my-command.js
./src/my-command.js
Module build failed: Error: [BABEL] /Users/.../sketch/plugins/my-plugin1/src/my-command.js: .env is not allowed in preset options
    at /Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/validation/options.js:66:13
    at Array.forEach (<anonymous>)
    at validate (/Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/validation/options.js:64:21)
    at /Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/full.js:251:36
    at cachedFunction (/Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/caching.js:42:17)
    at loadPresetDescriptor (/Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/full.js:243:45)
    at /Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/full.js:68:19
    at Array.map (<anonymous>)
    at recurseDescriptors (/Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/full.js:66:36)
    at recurseDescriptors (/Users/.../sketch/plugins/my-plugin1/node_modules/@babel/core/lib/config/full.js:97:26)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-plugin1@0.1.0 build: `skpm-build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the my-plugin1@0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/.../.npm/_logs/2018-04-11T14_26_04_323Z-debug.log
```

The same error happens with `@skpm/builder` versions `0.5.0` and `0.5.1` though it looks to build successfully with `0.4.0`. 

package.json:
```json
{
  ...
  "devDependencies": {
    "@skpm/builder": "^0.5.0"
  },
  ...
}
```

**Workaround**: override the default babel config with a custom `.babelrc` in the root dir:
```
{
  "presets": ["babel-preset-env"]
}
```

```
$ npm run build

> my-plugin1@0.1.0 build /Users/.../sketch/plugins/my-plugin1
> skpm-build

[1/3] 🖨  Copied src/manifest.json in 2ms
[2/3] ⛏  Copied assets/icon.png
[3/3] 🔨  Built ./my-command.js in 372ms
success Plugin built
```