fix(install): fix install method

.vim_runtime/sources_non_forked/vim-markdown/.travis.yml

@@ -0,0 +1,34 @@
+language: vim
+
+os:
+  - linux
+  - osx
+
+env:
+  - TEST=package
+  - TEST=latest
+
+before_script: |
+  if [ "$TEST" = "package" ]; then
+    if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+      sudo apt-get -y update
+      sudo apt-get -y install vim
+    fi
+  else
+    cd ..
+    git clone --depth 1 https://github.com/vim/vim
+    cd vim
+    ./configure --with-features=huge
+    make
+    sudo make install
+    export PATH="/usr/local/bin:$PATH"
+    cd "$TRAVIS_BUILD_DIR"
+  fi
+  if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+    curl https://bootstrap.pypa.io/get-pip.py | sudo python
+  fi
+  sudo -H pip install virtualenv
+
+script:
+  - make test
+  - make doc