remove coverage bits from travis build

I don't find them valuable and they make it harder for travis
to run on multiple operating systems.

.travis.yml

@@ -49,20 +49,4 @@ addons:
 env:
   global:
       - PKG_CONFIG_PATH=$TRAVIS_BUILD_DIR/lib/pkgconfig
-#  global:
-#    - RUSTFLAGS="-C link-dead-code"
 
-after_success: |
-  wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz &&
-  tar xzf master.tar.gz &&
-  cd kcov-master &&
-  mkdir build &&
-  cd build &&
-  cmake .. &&
-  make &&
-  make install DESTDIR=../../kcov-build &&
-  cd ../.. &&
-  rm -rf kcov-master &&
-  for file in target/debug/term-*[^\.d] target/debug/wezterm-*[^\.d]; do mkdir -p "target/cov/$(basename $file)"; ./kcov-build/usr/local/bin/kcov --exclude-pattern=/.cargo,/usr/lib --verify "target/cov/$(basename $file)" "$file"; done &&
-  bash <(curl -s https://codecov.io/bash) &&
-  echo "Uploaded code coverage"

README.md

@@ -3,8 +3,6 @@
 A terminal emulator implemented in Rust, using OpenGL ES 2 for rendering.
 
 [![Build Status](https://travis-ci.org/wez/wezterm.svg?branch=master)](https://travis-ci.org/wez/wezterm)
-[![codecov](https://codecov.io/gh/wez/wezterm/branch/master/graph/badge.svg)](https://codecov.io/gh/wez/wezterm)
-
 
 ![Screenshot](screenshots/one.png)