fix: makefile login shell file fix (#38)

This fixes the problem where installing kept adding hilbish to
`/etc/shells` even if it was already there.

* fix: makefile login shell file fix

* style: remove extra space in makefile

Makefile

@@ -10,7 +10,7 @@ install:
 	@install -v -d "$(DESTDIR)$(BINDIR)/" && install -m 0755 -v hilbish "$(DESTDIR)$(BINDIR)/hilbish"
 	@mkdir -p "$(DESTDIR)$(LIBDIR)"
 	@cp libs preload.lua .hilbishrc.lua "$(DESTDIR)$(LIBDIR)" -r
-	@echo "$(DESTDIR)$(BINDIR)/hilbish" >> /etc/shells
+	@grep "$(DESTDIR)$(BINDIR)/hilbish" -qxF /etc/shells || echo "$(DESTDIR)$(BINDIR)/hilbish" >> /etc/shells
 	@echo "Hilbish Installed"
 
 uninstall:

README.md

@@ -10,8 +10,8 @@
 
 Hilbish is an interactive Unix-like shell written in Go, with the config
 and other code written in Lua.  
-It is currently in a Beta state. Though very fit for daily usage,
-updates may contain breaking changes.
+It is sort of in a stable state currently, usable as a daily shell,
+but there may still be breaking changes in Lua modules.
 
 # Screenshots
 <div align="center">
@@ -57,12 +57,12 @@ sudo make all
 
 Alternativly, if you use Arch Linux, you can compile Hilbish with an **(unofficial)** AUR package
 ```sh
-yay -S hilbish-git
-```
-Or install a prebuilt binary from an **(unofficial)** AUR package
-```sh
 yay -S hilbish
 ```
+If you want the latest and greatest, you can install and compile from latest git commit  
+```sh
+yay -S hilbish-git
+```
 
 ### Uninstall
 ```sh