travis: remove coveralls, only use codecov

.travis.yml

@@ -41,9 +41,6 @@ install:
       git clone _old $TRAVIS_REPO_SLUG;
       cd $TRAVIS_REPO_SLUG;
     fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
-      go install github.com/mattn/goveralls;
-    fi
 
 script:
   - 'internal/runtests.sh'

README.md

@@ -2,7 +2,8 @@
 
 [![Build Status](https://travis-ci.com/google/wire.svg?branch=master)][travis]
 [![godoc](https://godoc.org/github.com/google/wire?status.svg)][godoc]
-[![Coverage Status](https://coveralls.io/repos/github/google/wire/badge.svg?branch=master)](https://coveralls.io/github/google/wire?branch=master)
+[![Coverage](https://codecov.io/gh/google/wire/branch/master/graph/badge.svg)](https://codecov.io/gh/google/wire)
+
 
 Wire is a code generation tool that automates connecting components using
 [dependency injection][]. Dependencies between components are represented in

internal/runtests.sh

@@ -24,11 +24,10 @@ fi
 result=0
 
 # Run Go tests. Only do coverage for the Linux build
-# because it is slow, and Coveralls will only save the last one anyway.
+# because it is slow, and codecov will only save the last one anyway.
 if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
   go test -race -coverpkg=./... -coverprofile=coverage.out ./... || result=1
   if [ -f coverage.out ]; then
-    goveralls -coverprofile=coverage.out -service=travis-ci
     bash <(curl -s https://codecov.io/bash)
   fi
   # Ensure that the code has no extra dependencies (including transitive