use github.com/sourcegraph/go-diff import path instead of custom sourcegraph.com/... import path

.travis.yml

@@ -1,22 +1,10 @@
 sudo: false
 language: go
 go:
-  - "1.10.x"
-  - "1.x"
-  - "tip"
-matrix:
-  allow_failures:
-    - go: tip
-  fast_finish: true
-before_install:
-  - mkdir -p $HOME/gopath/src/sourcegraph.com/sourcegraph
-  - mv $TRAVIS_BUILD_DIR $HOME/gopath/src/sourcegraph.com/sourcegraph/go-diff
-  - export TRAVIS_BUILD_DIR=$HOME/gopath/src/sourcegraph.com/sourcegraph/go-diff
-  - cd $TRAVIS_BUILD_DIR
-install:
-  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
+  - "1.12.x"
 script:
   - GO111MODULE=on go get -t -v ./...
   - diff -u <(echo -n) <(gofmt -d -s .)
-  - GO111MODULE=on go tool vet .
-  - GO111MODULE=on go test -v -race ./...
+  - GO111MODULE=on go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

cmd/go-diff/go-diff.go

@@ -7,7 +7,7 @@ import (
 	"log"
 	"os"
 
-	"sourcegraph.com/sourcegraph/go-diff/diff"
+	"github.com/sourcegraph/go-diff/diff"
 )
 
 // A diagnostic program to aid in debugging diff parsing or printing

diff/doc.go

@@ -1,2 +1,2 @@
 // Package diff provides a parser for unified diffs.
-package diff // import "sourcegraph.com/sourcegraph/go-diff/diff"
+package diff

diff/testdata/empty_multi.diff

@@ -1,11 +1,11 @@
-diff --git Godeps/_workspace/src/sourcegraph.com/sourcegraph/go-diff/diff/testdata/empty.diff Godeps/_workspace/src/sourcegraph.com/sourcegraph/go-diff/diff/testdata/empty.diff
+diff --git Godeps/_workspace/src/github.com/sourcegraph/go-diff/diff/testdata/empty.diff Godeps/_workspace/src/github.com/sourcegraph/go-diff/diff/testdata/empty.diff
 new file mode 100644
 index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
-diff --git Godeps/_workspace/src/sourcegraph.com/sourcegraph/go-diff/diff/testdata/empty_new.diff Godeps/_workspace/src/sourcegraph.com/sourcegraph/go-diff/diff/testdata/empty_new.diff
+diff --git Godeps/_workspace/src/github.com/sourcegraph/go-diff/diff/testdata/empty_new.diff Godeps/_workspace/src/github.com/sourcegraph/go-diff/diff/testdata/empty_new.diff
 new file mode 100644
 index 0000000000000000000000000000000000000000..527e2e70f57b02e709f53e3ac2b7f59e2b5a46bc
 --- /dev/null
-+++ Godeps/_workspace/src/sourcegraph.com/sourcegraph/go-diff/diff/testdata/empty_new.diff
++++ Godeps/_workspace/src/github.com/sourcegraph/go-diff/diff/testdata/empty_new.diff
 @@ -0,0 +1,2 @@
 +@@ -1,1 +0,0 @@
 +-b

go.mod

@@ -1,4 +1,4 @@
-module sourcegraph.com/sourcegraph/go-diff
+module github.com/sourcegraph/go-diff
 
 require (
 	github.com/gogo/protobuf v1.1.1