chore(docs): publish docs per version

.travis.yml

@@ -36,14 +36,10 @@ after_success: |
     tar xzf master.tar.gz && mkdir kcov-master/build && cd kcov-master/build && cmake .. && make && make install DESTDIR=../tmp && cd ../.. &&
     ls target/debug &&
     ./kcov-master/tmp/usr/local/bin/kcov --coveralls-id=$TRAVIS_JOB_ID --exclude-pattern=/.cargo target/kcov target/debug/hyper-* &&
-    [ $TRAVIS_BRANCH = master ] &&
     [ $TRAVIS_PULL_REQUEST = false ] &&
     [ $TRAVIS_RUST_VERSION = stable ] &&
     cargo doc --no-deps &&
-    echo '<meta http-equiv=refresh content=0;url=hyper/index.html>' > target/doc/index.html &&
-    pip install --user ghp-import &&
-    /home/travis/.local/bin/ghp-import -n target/doc &&
-    git push -fq https://${TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git gh-pages
+    ./.travis/docs.sh
 
 env:
     global: