Update dependency information in README.md

README.md

@@ -24,29 +24,24 @@ Windows).
 
 ## Dependencies
 
-To build Callisto, you'll need a C compiler and *ar* (a standard
-Unix archiving utility, should be included on every major Unix).
-The default C compiler is *cc* which is usually a symbolic link to
-your system's default C compiler. This should be gcc on Linux, and
-clang on most of the BSDs. If *cc* doesn't exist on your system,
+To build Callisto, you'll need nothing but a C compiler.
+The default C compiler is *cc* which is usually a symbolic link
+to your system's default C compiler. This should be gcc on Linux,
+and clang on most of the BSDs. If *cc* doesn't exist on your system,
 change the `CC` variable in the Makefile to your desired C compiler.
 
-At runtime you will need only these two libraries:
- - libm: basic math operations
- - libreadline: REPL history
-
-Both of these are very common and should be already installed on
-your machine.
+**Callisto has zero runtime dependencies**, unless you built it with
+support for GNU libreadline. Lua 5.4 is statically linked in.
 
 ## Installation
 
 Callisto is distributed as source-only, but don't worry, it's
 not hard to compile.
 
-First, get the source code using `git clone https://github.com/jtbx/callisto`
-then in the newly created directory, run `make` to compile Callisto.
-The compiled executable will be named `csto`, and does not depend
-on any Lua .so C modules or Lua files.
+First, get the source code using one of the tarballs found in
+the [Releases](https://github.com/jtbx/callisto/releases) page.
+Untar it then run `make` to compile Callisto. The compiled
+executable will be named `csto`.
 
 To install `csto` (the Callisto standalone executable) and
 `libcallisto.so` (the Callisto shared library), run `make install`