Update dependencies.

Author: jonkemp

package.json

@@ -7,25 +7,25 @@
     "test": "test"
   },
   "dependencies": {
-    "event-stream": "^3.3.1",
-    "glob": "^7.0.3",
-    "gulp-concat": "^2.5.2",
-    "gulp-if": "^2.0.0",
+    "event-stream": "^3.3.4",
+    "glob": "^7.1.2",
+    "gulp-concat": "^2.6.1",
+    "gulp-if": "^2.0.2",
     "is-relative-url": "1.0.0",
-    "plugin-error": "^0.1.2",
-    "through2": "^2.0.1",
-    "useref": "^1.2.0",
-    "vinyl-fs": "^3.0.0"
+    "plugin-error": "^1.0.1",
+    "through2": "^2.0.3",
+    "useref": "^1.4.1",
+    "vinyl-fs": "^3.0.2"
   },
   "devDependencies": {
     "coveralls": "^3.0.0",
-    "gulp": "^3.9.0",
-    "gulp-eslint": "^4.0.0",
-    "gulp-mocha": "^4.3.1",
+    "gulp": "^3.9.1",
+    "gulp-eslint": "^4.0.2",
+    "gulp-mocha": "^5.0.0",
     "gulp-rename": "^1.2.2",
     "mocha": "*",
     "mock-gulp-dest": "^0.1.1",
-    "nyc": "^11.3.0",
+    "nyc": "^11.4.1",
     "should": "*",
     "vinyl": "^2.1.0"
   },