Instruction for go install (schachmat#167)

Required by last go version

README.md

@@ -33,7 +33,7 @@ Check your distribution for packaging:
 
 To directly install or update the wego binary from Github into your `$GOPATH` as usual, run:
 ```shell
-go get -u github.com/schachmat/wego
+go install github.com/schachmat/wego@latest
 ```
 
 ## Setup