Fix microtime package

Author: Jed Mao

.travis.yml

@@ -1,5 +1,16 @@
 sudo: false
 
+# iojs requires GCC 4.8
+# https://github.com/wadey/node-microtime/issues/34#issuecomment-138529797
+env:
+  - CXX=g++-4.8
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - g++-4.8
+
 language: node_js
 node_js:
   - iojs

package.json

@@ -100,7 +100,7 @@
     "metalsmith-rss": "^1.0.0",
     "metalsmith-url": "^1.0.0",
     "metalsmith-watch": "^1.0.1",
-    "microtime": "^1.2.0",
+    "microtime": "^1.5.0",
     "nano-logger": "^1.0.0",
     "node-libs-browser": "^0.5.0",
     "normalize.css": "^3.0.3",