update g++

.travis.yml

@@ -1,4 +1,6 @@
 language: ruby
+env:
+  - CXX=g++-4.8
 rvm:
   - 2.0
   - 2.1
@@ -13,3 +15,4 @@ addons:
       - ubuntu-toolchain-r-test
     packages:
       - gcc-4.8
+      - g++-4.8

README.md

@@ -127,6 +127,9 @@ Or install it yourself as:
 
     $ gem install mini_racer
 
+
+**Note** v8.h seems to require gcc version 4.8 and up, if you are having issues installing try upgrading gcc
+
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