[Makefile] refs #28 Correcting comment and declare new phony `clean-s…

…kyhwd` and `test-skyhwd`

Makefile

@@ -136,6 +136,8 @@ test-libc: build-libc ## Run tests for libskycoin C client library
 
 test-skyapi: build-skyapi ## Run test for skyapi(libcurl based) library
 
+test-skyhwd: build-skyhwd ## Run test for Hardware Wallet Daemon(libcurl based) library
+
 test: test-libc test-skyapi test-skyhwd ## Run all test for libskycoin
 
 docs-skyapi: ## Generate SkyApi (libcurl) documentation
@@ -229,7 +231,7 @@ clean-libc: ## Clean files generated by libc
 clean-skyapi: ## Clean files generated by skyapi
 	rm -rfv $(BUILDLIBSKYAPI_DIR)
 
-clean-skyapi: ## Clean files generated by skyapi
+clean-skyhwd: ## Clean files generated by skyhwd
 	rm -rfv $(BUILDLIBSKYHWD_DIR)
 
 clean: clean-libc clean-skyapi clean-skyhwd ## Clean all files generated by libraries