Install GHR from binary

.travis.yml

@@ -1,7 +1,9 @@
-language: generic
+addons:
+  apt:
+    packages:
+    - libgmp-dev
+language: c
 sudo: false
-go:
-- 1.7.x
 cache:
   directories:
   - $HOME/.local/bin
@@ -11,10 +13,7 @@ os:
 - osx
 before_install:
 - sh tools/install-stack.sh
-install:
-- export GOPATH="${TRAVIS_BUILD_DIR}/go"
-- export PATH="${TRAVIS_BUILD_DIR}/go/bin:$PATH"
-- go get -u github.com/tcnksm/ghr
+- sh tools/install-ghr.sh
 script:
 - stack setup
 - stack build --ghc-options -O2 --pedantic

tools/install-ghr.sh

@@ -0,0 +1,20 @@
+set -o errexit -o verbose
+
+if test ! "$TRAVIS_TAG"
+then
+  echo 'This is not a release build.'
+else
+    if [ "$TRAVIS_OS_NAME" = "linux" ] 
+    then
+        ARCH="linux"
+    else
+        ARCH="darwin"
+    fi
+  echo "Installing ghr"
+  URL="https://github.com/tcnksm/ghr/releases/download/v0.5.4/ghr_v0.5.4_${ARCH}_386.zip"
+  curl -L ${URL} > ghr.zip
+  mkdir -p "$HOME/bin"
+  export PATH="$HOME/bin:$PATH"
+  unzip ghr.zip -d "$HOME/bin"
+  rm ghr.zip
+fi