add version to build runner file

Author: dasimmet

src/runner-zig.zig

@@ -4,6 +4,7 @@ const builtin = @import("builtin");
 const later_than_zig_15 = builtin.zig_version.order(std.SemanticVersion.parse("0.15.99") catch unreachable) == .gt;
 
 pub const runner = if (later_than_zig_15)
+    // 0.16.0-dev.1354+94e98bfe8
     @import("runner-zig-master.zig")
 else
     @import("runner-zig-0.15.X.zig");