var -> const and other build fixes (#18)

* Update var to const in build.zig where applicable

This no longer builds with the latest version of Zig.

See: ziglang/zig#18017

* Update zig-wcwidth

This includes fixes to make build.zig build again.

* Add now-required paths field to build.zig.zon

build.zig

@@ -32,7 +32,7 @@ pub fn build(b: *Build) void {
     b.installArtifact(lib);
 
     // Tests
-    var main_tests = b.addTest(.{
+    const main_tests = b.addTest(.{
         .name = "main-tests",
         .root_source_file = FileSource.relative("src/main.zig"),
         .target = target,

build.zig.zon

@@ -3,8 +3,18 @@
     .version = "0.1.0",
     .dependencies = .{
         .wcwidth = .{
-            .url = "https://github.com/joachimschmidt557/zig-wcwidth/archive/2d4055f63646ebc88503fe01940dd11ad535c1dc.tar.gz",
-            .hash = "122007ac41a9484316323499e55dc0b2fa9fdaffd9452933602552c631cf98d9ff72",
+            .url = "https://github.com/joachimschmidt557/zig-wcwidth/archive/7fc06445d17beb94fe06ad0d60d636e40fe8490a.tar.gz",
+            .hash = "1220ae6991b133c3c0f9b8989ee15f26d02f44a21ef5d77ca1e8c3232356cb45d51b",
         },
     },
+    .paths = .{
+        "LICENSE",
+        "README.md",
+        "build.zig",
+        "build.zig.zon",
+        "history.txt",
+        "examples/",
+        "includes/",
+        "src/",
+    },
 }