🔥 limit the potential unit test holder for 3.8 only. let's not waste travis ci resources

Author: chfw

.moban.yml

@@ -14,7 +14,7 @@ targets:
   - "test.sh": test.script.jj2
   - "pypi_mobans_pkg/_version.py": "_version.py.jj2"
   - .gitignore: gitignore.jj2
-  - .travis.yml: travis.yml.jj2
+  - .travis.yml: custom_travis.yml.jj2
   - output: "CHANGELOG.rst"
     configuration: changelog.yml
     template: CHANGELOG.rst.jj2

.travis.yml

@@ -4,13 +4,7 @@ language: python
 notifications:
   email: false
 python:
-  - &pypy2 pypy2.7-6.0
-  - &pypy3 pypy3.5-6.0
   - 3.8
-  - 3.7
-  - 3.6
-  - 3.5
-  - 2.7
 
 stages:
   - lint