fix: add newline to the end of composer.json

Author: ramsey

src/LibraryStarterKit/Task/Builder/UpdateComposerJson.php

@@ -88,7 +88,7 @@ public function build(): void
 
         $this->getEnvironment()->getFilesystem()->dumpFile(
             $this->getEnvironment()->path('composer.json'),
-            (string) json_encode($composer, self::JSON_OPTIONS),
+            (string) json_encode($composer, self::JSON_OPTIONS) . "\n",
         );
     }
 

tests/LibraryStarterKit/Task/Builder/__snapshots__/UpdateComposerJsonTest__testBuildWithMinimalComposerJson__1.txt

@@ -9,4 +9,4 @@
             "name": "Jane Doe"
         }
     ]
-}
+}

tests/LibraryStarterKit/Task/Builder/__snapshots__/UpdateComposerJsonTest__testBuild__1.txt

@@ -43,4 +43,4 @@
     },
     "minimum-stability": "dev",
     "prefer-stable": true
-}
+}