fix: watching configuration (#553)

Author: alexander-akait

src/utils.js

@@ -64,6 +64,7 @@ async function loadConfig(loaderContext, config, postcssOptions) {
   }
 
   loaderContext.addBuildDependency(result.filepath);
+  loaderContext.addDependency(result.filepath);
 
   if (result.isEmpty) {
     return result;

test/config-autoload.test.js

@@ -8,6 +8,7 @@ const testDirectory = path.resolve(__dirname, "fixtures", "config-autoload");
 const loaderContext = {
   fs,
   addBuildDependency: () => true,
+  addDependency: () => true,
 };
 
 describe("autoload config", () => {