removed deprecated field in Travis config (#25)

Signed-off-by: StrikerRUS <nekit94-12@hotmail.com>

.travis.yml

@@ -1,4 +1,3 @@
-sudo: required
 dist: xenial # ubuntu 16.04 distro
 script:
   # Install dependencies
@@ -6,6 +5,6 @@ script:
   # It will ignore if travis ci committed, else works as it is.
   - author=`git log -1 --pretty=format:'%an'` && if [[ "$author"  != "Travis CI" ]]; then make versionmaker; fi
   - make combineExpCR
-after_success: 
+after_success:
    # runs only when PR is merged and push the version file to master version
   - if [[ $TRAVIS_PULL_REQUEST == 'false' ]]; then make push; fi