diff --git a/.travis.yml b/.travis.yml
index 475d819..dd8ec18 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,8 @@ go:
   - "tip"
 
 before_install:
-  - go get github.com/mattn/goveralls
+  - go get -d github.com/mattn/goveralls
+  - go install github.com/mattn/goveralls
 
 script:
   - $GOPATH/bin/goveralls -v -service=travis-ci
diff --git a/README.md b/README.md
index 2fa440b..4ce1a2d 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ Some applications are built using `go-cli` including:
 To install `go-cli`, simply run:
 
 ```bash
-go get github.com/subchen/go-cli
+go get github.com/subchen/go-cli/v3
 ```
 
 ## Syntax for Command Line
@@ -90,7 +90,7 @@ package main
 import (
     "fmt"
     "os"
-    "github.com/subchen/go-cli"
+    "github.com/subchen/go-cli/v3"
 )
 
 func main() {
@@ -359,7 +359,7 @@ import (
     "fmt"
     "os"
     "strings"
-    "github.com/subchen/go-cli"
+    "github.com/subchen/go-cli/v3"
 )
 
 func main() {
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a8109ca
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/subchen/go-cli/v3
+
+go 1.15