feat: More strictly handle resource compiler issues. (#20)

Author: FabianLars

.changes/manifest-required.md

@@ -0,0 +1,5 @@
+---
+winres: minor
+---
+
+`winres` is now more strict about `embed_resource`'s result (using manifest_required instead of manifest_option) and therefore may panic more likely, for example if the environment is missing a resource compiler.

src/lib.rs

@@ -533,7 +533,7 @@ impl WindowsResource {
 
         // This matches v2 behavior
         embed_resource::compile(rc, embed_resource::NONE)
-            .manifest_optional()
+            .manifest_required()
             .unwrap();
 
         Ok(())
@@ -560,7 +560,7 @@ impl WindowsResource {
 
         // This matches v2 behavior
         embed_resource::compile_for("resource.rc", binaries, embed_resource::NONE)
-            .manifest_optional()
+            .manifest_required()
             .unwrap();
 
         Ok(())