Update .travis.yml

Author: 0x00b1

.travis.yml

@@ -1,8 +1,6 @@
 language: python
 python:
-- 2.7
-- 3.5
-- 3.6
+- 3.8
 sudo: false
 notifications:
   email: false
@@ -21,7 +19,7 @@ deploy:
     secure: Z88A/qARvvwFdogCnwiybg9g8+FTiJmTKh4rkfoOkFJP02dirWC3lDf8ZEUGo8Uk9QgO+M9BhcJR6vy7STGHYuVF+xC3lz9nuIQj39JkGfHOdy2aUOwiNQLES6jVGEzhJdDv4mJ5Wg481m0ZFGFxzjnAkpVBR2wxCyN80hcOXPc=
   distributions: "sdist bdist_wheel"
   on:
-    python: 2.7
+    python: 3.8
     tags: true
     repo: CellProfiler/python-bioformats
   skip_cleanup: true