Normalize path names in report

Also ensure that we get platform-specific line endings when checking out
the expected logs.

Author: ecstatic-morse

.gitattributes

@@ -5,3 +5,4 @@
 *.md text eol=lf
 *.gitignore text eol=lf
 *.gitattributes text eol=lf
+*.json text eol=lf

src/report/mod.rs

@@ -145,7 +145,7 @@ pub fn generate_report<DB: ReadResults>(
                     log: crate_to_path_fragment(tc, &krate, true)
                         .to_str()
                         .unwrap()
-                        .to_string(),
+                        .replace(r"\", "/"),
                 })
             });
             // Convert errors to Nones