Fix build when using go modules (#6)

vendor/github.com/client9/misspell/RELEASE-HOWTO.md

@@ -0,0 +1,38 @@
+# Release HOWTO
+
+since I forget.
+
+
+1. Review existing tags and pick new release number
+
+    ```sh
+    git tag
+    ```
+
+2. Tag locally 
+
+    ```sh
+    git tag -a v0.1.0 -m "First release"
+    ```
+
+   If things get screwed up, delete the tag with
+
+   ```sh
+   git tag -d v0.1.0
+   ```
+
+3. Test goreleaser
+
+   TODO: how to install goreleaser
+
+   ```sh
+   ./scripts/goreleaser-dryrun.sh
+   ```
+
+4. Push
+
+    ```bash
+    git push origin v0.1.0
+    ```
+
+5. Verify release and edit notes. See https://github.com/client9/misspell/releases