Support Alpine Linux #194 (#545)

* Support Alpine Linux #194

* Fix testcase

* Fix README

* Fix dep files

* Fix changelog

* Bump up version

scan/serverapi.go

@@ -106,6 +106,11 @@ func detectOS(c config.ServerInfo) (osType osTypeInterface) {
 		return
 	}
 
+	if itsMe, osType = detectAlpine(c); itsMe {
+		util.Log.Debugf("Alpine. Host: %s:%s", c.Host, c.Port)
+		return
+	}
+
 	//TODO darwin https://github.com/mizzy/specinfra/blob/master/lib/specinfra/helper/detect_os/darwin.rb
 	osType.setErrs([]error{fmt.Errorf("Unknown OS Type")})
 	return