Merge pull request #12 from MatthewCroughan/patch-1

Tell users to enable module mode in go env #11

README.md

@@ -36,6 +36,20 @@ Or you can install by building from source directly as follows. Go toolchain is
 $ go get -u github.com/rhysd/notes-cli/cmd/notes
 ```
 
+If the build fails due to https://github.com/golang/go/issues/30515 then you may have to enable `module mode` as described in `go help env`
+
+*Temporarily* enable it for this installation only:
+
+```
+GO111MODULE=on go get -u github.com/rhysd/notes-cli/cmd/notes
+```
+
+*Permanently* enable this in your goenv config (May conflict with other projects)
+
+```
+go env -w GO111MODULE=on
+```
+
 Before starting to use, you can try it with examples.
 
 ```sh