Update .travis.yml

Author: tabesin

.travis.yml

@@ -22,6 +22,9 @@ include:
 
 sudo: required
 
+git:
+  depth: 8
+
 script:
   - chmod +x ./build.sh
   - ./build.sh |& tee log.txt
@@ -51,4 +54,4 @@ after_deploy:
   - cd mail-scripts && ./mail.py
 
 after_failure:
-  - cd mail-scripts && ./mail-fail.py
+  - cd mail-scripts && ./mail-fail.py