Merge pull request #5 from Bargamut/master

Replace gulp-util to plugin-error and some upgrade

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
 node_js:
-  - '0.10'
+  - '10'
 after_script:
   - npm run coveralls

index.js

@@ -1,5 +1,5 @@
 'use strict';
-var gutil = require('gulp-util');
+var pluginError = require('plugin-error');
 var through = require('through2');
 var iconv = require('iconv-lite');
 
@@ -10,7 +10,7 @@ module.exports = function (options) {
 	options = options || {};
 
 	if (!options.from && !options.to) {
-		throw new gutil.PluginError('gulp-convert-encoding', 'At least one of `from` or `to` required');
+		throw new pluginError('gulp-convert-encoding', 'At least one of `from` or `to` required');
 	}
 
 	options.from = options.from || UTF8;
@@ -33,7 +33,7 @@ module.exports = function (options) {
 					.pipe(iconv.encodeStream(options.to, options.iconv.encode));
 				this.push(file);
 			} catch (err) {
-				this.emit('error', new gutil.PluginError('gulp-convert-encoding', err));
+				this.emit('error', new pluginError('gulp-convert-encoding', err));
 			}
 		}
 
@@ -43,7 +43,7 @@ module.exports = function (options) {
 				file.contents = iconv.encode(content, options.to, options.iconv.encode);
 				this.push(file);
 			} catch (err) {
-				this.emit('error', new gutil.PluginError('gulp-convert-encoding', err));
+				this.emit('error', new pluginError('gulp-convert-encoding', err));
 			}
 		}