Change versioning scheme to <package>+<upstream>

README.md

@@ -4,12 +4,19 @@ This is [libgit2](https://libgit2.org/) packaged using Zig's build system.
 While libgit2 supports many different options for system dependencies, I've opted to use [MbedTLS](https://www.trustedfirmware.org/projects/mbed-tls/) by default on Linux for TLS, crypto, and certificate support. You can replace MbedTLS with OpenSSL if you prefer. SSH support is optional, and is provided by [libssh2](https://libssh2.org/). 
 All other dependencies are bundled in the source tree and compiled statically.
 
+## Versioning
+See `build.zig.zon` for the current Zig version, see releases for support for previous Zig/libgit2 versions.
+
+The versions specified in `build.zig.zon` are split between the package version (before the plus)
+and the libgit2 version (after the plus). For example, version `1.0.0+1.9.0` is package version 1.0.0
+with support for libgit2 1.9.0.
+
 ## Usage
 Update your `build.zig.zon`:
 ```sh
 zig fetch --save git+https://github.com/allyourcodebase/libgit2
 # or if you want a tagged release
-zig fetch --save https://github.com/allyourcodebase/libgit2/archive/refs/tags/${tag}.tar.gz
+zig fetch --save git+https://github.com/allyourcodebase/libgit2#${tag}
 ```
 
 Then, in your `build.zig`, you can access the library as a dependency:

build.zig.zon

@@ -1,10 +1,11 @@
 .{
     .name = .libgit2,
-    .version = "1.9.0",
+    .version = "1.0.0+1.9.0",
     .minimum_zig_version = "0.16.0",
     .fingerprint = 0x7f0051374dea2cba,
     .dependencies = .{
         .libgit2 = .{
+            .version = "1.9.0",
             .url = "https://github.com/libgit2/libgit2/archive/refs/tags/v1.9.0.tar.gz",
             .hash = "N-V-__8AAJbmLwHHxHDWkz0i6WIR6FpNe6tXSLzaPuWtvBBg",
         },

build/include.h

@@ -1,6 +1,3 @@
-#ifndef INCLUDE_git_include_h__
-#define INCLUDE_git_include_h__
-
 #include "git2.h"
 #include "git2/sys/alloc.h"
 #include "git2/sys/commit_graph.h"
@@ -24,5 +21,3 @@
 #include "git2/sys/refs.h"
 #include "git2/sys/remote.h"
 #include "git2/sys/repository.h"
-
-#endif // INCLUDE_git_include_h__INCLUDED