Add terminating newline to generated tsconfig.json

This commit adds a terminating newline to tsconfig.json
generated by `tsc --init`, just like `npm init`'s package.json.

The main reason I created this pull request is for editor friendliness.
Recently I created a new TypeScript project with `tsc --init`,
then I modified some compilerOptions and tried to git-commit the change,
but I found a newline was automatically added by my editor.

I think it's better that the default tsconfig.json template has a
terminating newline.

src/compiler/commandLineParser.ts

@@ -1893,7 +1893,7 @@ namespace ts {
             }
             result.push(`}`);
 
-            return result.join(newLine);
+            return result.join(newLine) + newLine;
         }
     }
 

tests/baselines/reference/tsConfig/Default initialized TSConfig/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with advanced options/tsconfig.json

@@ -62,4 +62,4 @@
     "declarationDir": "lib",                  /* Output directory for generated declaration files. */
     "skipLibCheck": true                      /* Skip type checking of declaration files. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with boolean value compiler options/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with enum value compiler options/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with files options/tsconfig.json

@@ -62,4 +62,4 @@
     "file1.ts",
     "file2.ts"
   ]
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option value/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options with enum value/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}

tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options/tsconfig.json

@@ -57,4 +57,4 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   }
-}
+}