Fixing yml syntax error

[rscottmerkleinc]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch crypto-browserify@3.12.1 for the project I'm working on.

Here is the diff that solved my problem:

diff --git a/node_modules/crypto-browserify/.travis.yml b/node_modules/crypto-browserify/.travis.yml
index 6bbb3c9..b67689d 100644
--- a/node_modules/crypto-browserify/.travis.yml
+++ b/node_modules/crypto-browserify/.travis.yml
@@ -2,6 +2,7 @@ sudo: false
 language: node_js
 matrix:
   include:
+    - node_js: '4'
       env: TEST_SUITE=browser BROWSER_NAME=ie BROWSER_VERSION="10..latest"
     - node_js: '4'
       env: TEST_SUITE=browser BROWSER_NAME=chrome BROWSER_VERSION="-2..beta"

This issue body was partially generated by patch-package.