Add newline at end of generated file content

generators/writeExercise.js

@@ -10,7 +10,8 @@ async function writeExercise(exercisePath) {
 };
   
 // Do not edit below this line
-module.exports = ${exerciseName};`;
+module.exports = ${exerciseName};
+`;
 
   await writeFile(
     join(

generators/writeExerciseSpec.js

@@ -23,7 +23,8 @@ describe('${exerciseName}', () => {
 
     expect(${exerciseName}()).toBe('');
   });
-});`;
+});
+`;
 
   await writeFile(
     join(exercisePath, `${trueExerciseName}.spec.js`),

generators/writeReadme.js

@@ -6,7 +6,8 @@ async function writeReadme(exercisePath) {
   const { exerciseNumber, exerciseName } = splitDirectoryName(exercisePath);
   const readmeContent = `# Exercise ${exerciseNumber} - ${exerciseName}
 
-Description of the exercise goes here.`;
+Description of the exercise goes here.
+`;
 
   await writeFile(join(exercisePath, "README.md"), readmeContent);
 }