sort dependencies alphabetically after reading them

This is mostly to make the tests reliable.

Without this the dependencies are inserted into the vector in directory
order, which in my checkout of the repo did not match the alphabetical
order of the dependencies in the test.

src/issue.rs

@@ -212,6 +212,9 @@ impl Issue {
                 }
             }
         }
+        if let Some(deps) = &mut dependencies {
+            deps.sort();
+        }
         Ok(dependencies)
     }