Re-add `'use strict' statements.

They are still needed.

cli.js

@@ -1,5 +1,7 @@
 #!/usr/bin/env node
 
+'use strict';
+
 const spawn = require('child_process').spawn;
 const hugo = require('.');
 const input = process.argv.slice(2);

index.js

@@ -1 +1,3 @@
+'use strict';
+
 module.exports = require('./lib')(process.cwd()).path();

lib/index.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const path = require('path');
 const BinWrapper = require('bin-wrapper');
 const pkgConf = require('pkg-conf');

lib/install.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const path = require('path');
 const signale = require('signale');
 const bin = require('.');

package.json

@@ -40,9 +40,6 @@
     "env": {
       "es6": true,
       "node": true
-    },
-    "parserOptions": {
-      "sourceType": "module"
     }
   }
 }

test/index.js

@@ -1,5 +1,7 @@
 /* eslint-env mocha */
 
+'use strict';
+
 const assert = require('assert');
 const binCheck = require('bin-check');
 const hugoBin = require('..');