Add CRC-32 values to the list of non-free files

These are useful for identifying the files in moparisthebest's archive,
as the file names include the CRC-32 value for cache busting.

I'm keeping the SHA-256 checksums - they provide further assurance as
it's very easy to generate a CRC-32 collision.

Signed-off-by: Graham <gpe@openrs2.dev>

README.md

@@ -34,16 +34,16 @@ nonfree
     └── unpackclass.pack
 ```
 
-The SHA-256 checksums of the correct files are:
-
-```
-d39578f4a88a376bcb2571f05da1939a14a80d8c4ed89a4eb172d9e525795fe2  nonfree/lib/jaggl.pack200
-31182683ba04dc0ad45859161c13f66424b10deb0b2df10aa58b48bba57402db  nonfree/lib/loader_gl.jar
-ccdfaa86be07452ddd69f869ade86ea900dbb916fd853db16602edf2eb54211b  nonfree/lib/loader.jar
-4a5032ea8079d2154617ae1f21dfcc46a10e023c8ba23a4827d5e25e75c73045  nonfree/lib/runescape_gl.pack200
-0ab28a95e7c5993860ff439ebb331c0df02ad40aa1f544777ed91b46d30d3d24  nonfree/lib/runescape.jar
-7c090e07f8d754d09804ff6e9733ef3ba227893b6b639436db90977b39122590  nonfree/lib/unpackclass.pack
-```
+The CRC-32 values and SHA-256 checksums of the correct files are:
+
+| CRC-32 value  | SHA-256 checksum                                                   | File                               |
+|--------------:|--------------------------------------------------------------------|------------------------------------|
+| `-1418094567` | `d39578f4a88a376bcb2571f05da1939a14a80d8c4ed89a4eb172d9e525795fe2` | `nonfree/lib/jaggl.pack200`        |
+| `-2129469231` | `31182683ba04dc0ad45859161c13f66424b10deb0b2df10aa58b48bba57402db` | `nonfree/lib/loader_gl.jar`        |
+| `-1516355035` | `ccdfaa86be07452ddd69f869ade86ea900dbb916fd853db16602edf2eb54211b` | `nonfree/lib/loader.jar`           |
+|  `-132784534` | `4a5032ea8079d2154617ae1f21dfcc46a10e023c8ba23a4827d5e25e75c73045` | `nonfree/lib/runescape_gl.pack200` |
+|  `1692522675` | `0ab28a95e7c5993860ff439ebb331c0df02ad40aa1f544777ed91b46d30d3d24` | `nonfree/lib/runescape.jar`        |
+| `-1911426584` | `7c090e07f8d754d09804ff6e9733ef3ba227893b6b639436db90977b39122590` | `nonfree/lib/unpackclass.pack`     |
 
 The `nonfree` directory is included in the `.gitignore` file to prevent any
 non-free material from being accidentally included in the repository.