.travis.yml: Add python 3.4.3 check
.travis.yml: Add python 3.4.3 check

Adds python 3.4.3 check to Travis CI

Closes https://github.com/coala/coala/issues/5319

coala/coala,SanketDG/coala,coala-analyzer/coala,coala-analyzer/coala,jayvdb/coala,SanketDG/coala,coala-analyzer/coala,SanketDG/coala,coala/coala,coala/coala,jayvdb/coala,jayvdb/coala