Fix BUILD.md
Fix `make` command for `kopia-ui`.
@@ -14,7 +14,7 @@ Kopia build is based on `Makefile` and provides the following main targets:
* `$ make install-noui` - builds simplified `kopia` executable without embedded graphical UI. The output is stored in `$HOME/go/bin/kopia`
-* `$ make install` - builds desktop application based on [Electron](https://electronjs.org) using [Electron Builder](https://electron.build) The output is stored in the `dist/kopia-ui` subdirectory
+* `$ make kopia-ui` - builds desktop application based on [Electron](https://electronjs.org) using [Electron Builder](https://electron.build) The output is stored in the `dist/kopia-ui` subdirectory
* `$ make website` - builds [kopia.io](https://kopia.io) website using [Hugo](https://gohugo.io). The output is stored in `site/public` and published to [Github Pages](https://github.com/kopia/kopia.github.io) from [Travis CI](https://travis-ci.org/kopia/kopia) on each build.
