Feature/zig 0.15 upgrade (#1)

* fix: adjust build and stdout

* fix: compiles on 0.15

* fix: fix io changes

* fix: update github action zig version

build.zig

@@ -15,8 +15,7 @@ pub fn build(b: *std.Build) void {
     // set a preferred release mode, allowing the user to decide how to optimize.
     const optimize = b.standardOptimizeOption(.{});
 
-    const lib = b.addStaticLibrary(.{
-        .name = "csvu",
+    const lib = b.addModule("csvu", .{
         // In this case the main source file is merely a path, however, in more
         // complicated build scripts, this could be a generated file.
         .root_source_file = b.path("src/root.zig"),
@@ -27,13 +26,11 @@ pub fn build(b: *std.Build) void {
     // This declares intent for the library to be installed into the standard
     // location when the user invokes the "install" step (the default step when
     // running `zig build`).
-    b.installArtifact(lib);
+    //b.installArtifact(lib);
 
     const exe = b.addExecutable(.{
         .name = "csvu",
-        .root_source_file = b.path("src/main.zig"),
-        .target = target,
-        .optimize = optimize,
+        .root_module = b.createModule(.{ .root_source_file = b.path("src/main.zig"), .target = target, .optimize = optimize, .imports = &.{.{ .name = "csvu", .module = lib }} }),
     });
 
     // This declares intent for the executable to be installed into the
@@ -67,17 +64,21 @@ pub fn build(b: *std.Build) void {
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
     const lib_unit_tests = b.addTest(.{
-        .root_source_file = b.path("src/root.zig"),
-        .target = target,
-        .optimize = optimize,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/root.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
     });
 
     const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
 
     const exe_unit_tests = b.addTest(.{
-        .root_source_file = b.path("src/main.zig"),
-        .target = target,
-        .optimize = optimize,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
     });
 
     const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);