Removes spell check of md files stage from travis.yml (#265)

Author: mnoman09

.travis.yml

@@ -38,18 +38,6 @@ jobs:
         - find . -type f -name '*.md' -exec awesome_bot {} \;
       notifications:
         email: false
-    - stage: 'Lint markdown files'
-      os: linux
-      language: generic
-      before_install: skip
-      install:
-        - npm i -g markdown-spellcheck
-      before_script:
-        # todo: change branch to master once merged.
-        - wget --quiet https://raw.githubusercontent.com/optimizely/mdspell-config/master/.spelling
-      script:
-        - mdspell -a -n -r --en-us '**/*.md'
-      after_success: skip
 
     - &integrationtest
       stage: 'Integration tests'