misc: small fix or general refactoring i did not bother commenting

Makefile

@@ -21,8 +21,6 @@ clean:
 install:
 	@mkdir -p /usr/local/share/bettercap/caplets
 	@cp bettercap /usr/local/bin/
-	@cp bettercap.service /etc/systemd/system/
-	@systemctl daemon-reload
 
 docker:
 	@docker build -t bettercap:latest .

README.md

@@ -18,17 +18,21 @@ A [precompiled version is available](https://github.com/bettercap/bettercap/rele
 Make sure you have a correctly configured **Go >= 1.8** environment, that `$GOPATH/bin` is in `$PATH`, that the `libpcap-dev` and `libnetfilter-queue-dev` (this one is only required on Linux) package installed for your system and then:
 
     $ go get github.com/bettercap/bettercap
+    $ cd $GOPATH/src/github.com/bettercap/bettercap
+    $ make && sudo make install
 
-This command will download bettercap, install its dependencies, compile it and move the `bettercap` executable to `$GOPATH/bin`. 
+This command will download bettercap, install its dependencies, compile it and move the `bettercap` executable to `/usr/local/bin`. 
 
 Now you can use `sudo bettercap -h` to show the basic command line options and just `sudo bettercap` to start an 
 [interactive session](https://github.com/bettercap/bettercap/wiki/Interactive-Mode) on your default network interface, otherwise you can [load a caplet](https://github.com/bettercap/bettercap/wiki/Caplets) from [the dedicated repository](https://github.com/bettercap/caplets).
 
 ## Update
 
-In order to update to an unstable but bleeding edge release from this repository, run the command below:
+In order to update to an unstable but bleeding edge release from this repository, run the commands below:
 
     $ go get -u github.com/bettercap/bettercap
+    $ cd $GOPATH/src/github.com/bettercap/bettercap
+    $ make && sudo make install
 
 ## Documentation and Examples