.travis.yml in rtesseract-3.0.4 vs .travis.yml in rtesseract-3.0.5

@@ -7,11 +7,11 @@
 
 before_install:
   - sudo add-apt-repository ppa:alex-p/tesseract-ocr -y
   - sudo apt-get update -q
   - sudo apt-get install tesseract-ocr tesseract-ocr-eng ghostscript -y
-  - gem install bundler -v 1.17.1
+  - gem install bundler
 
 rvm:
-  - 2.4.5
-  - 2.5.3
-  - 2.6.0
+  - 2.5.5
+  - 2.6.5
+  - 2.7.0