Install binary to /usr/bin instead of /bin

makefile

@@ -1,6 +1,6 @@
 install:
 	@echo "Installing git ommix !"
-	install -m755 git-ommix /bin/git-ommix
+	install -m755 git-ommix /usr/bin/git-ommix
 	install -m644 example.conf /etc/gitommix.conf
 
 	mkdir -p /usr/share/git-ommix
@@ -10,6 +10,6 @@ install:
 
 uninstall:
 	@echo "Uninstalling…"
-	rm -rf /bin/git-ommix
+	rm -rf /usr/bin/git-ommix
 	rm -rf /usr/share/git-ommix
 	[ -d /usr/share/bash-completion/completions ] && rm -rf /usr/share/bash-completion/completions/git-ommix