Use await on closing connection and readme update

Author: murilopolese

README.md

@@ -4,7 +4,7 @@ This is an partial port of [pyboard.py](https://docs.micropython.org/en/latest/r
 
 ## Basic usage
 
-```
+```js
 const Board = require('micropython.js')
 // Instantiate board class
 const board = new Board()
@@ -26,7 +26,7 @@ const rootFiles = await board.fs_ils()
 console.log('files at /', rootFiles)
 
 // Close serial
-board.close()
+await board.close()
 ```
 
 ## Examples

examples/02_execute_file.js

@@ -7,7 +7,7 @@ async function main() {
   const output = await board.execfile('./test.py')
   console.log('output')
   console.log(output)
-  board.close()
+  await board.close()
 }
 
 main()

examples/03_put_file.js

@@ -6,7 +6,7 @@ async function main() {
   console.log('sending file to board')
   await board.fs_put('./big_file.py', 'test.py', console.log)
   console.log('done')
-  board.close()
+  await board.close()
 }
 
 main()

examples/04_remove_file.js

@@ -6,7 +6,7 @@ async function main() {
   console.log('removing file from board')
   await board.fs_rm('test.py')
   console.log('done')
-  board.close()
+  await board.close()
 }
 
 main()

examples/05_list_files.js

@@ -9,7 +9,7 @@ async function main() {
   const libFiles = await board.fs_ils('lib')
   console.log('files at /lib')
   console.log(libFiles)
-  board.close()
+  await board.close()
 }
 
 main()

examples/06_get_file_contents.js

@@ -6,7 +6,7 @@ async function main() {
   const output = await board.fs_cat('test.py')
   console.log('file contents:')
   console.log(output)
-  board.close()
+  await board.close()
 }
 
 main()

examples/07_save_file.js

@@ -24,7 +24,7 @@ async function main() {
   console.log('saving content to file')
   await board.fs_save(content, 'test.py')
   console.log('done')
-  board.close()
+  await board.close()
 }
 
 main()

examples/08_file_exists.js

@@ -18,7 +18,7 @@ async function main() {
     console.log('xxxxxxxxxxx does not exist')
   }
 
-  board.close()
+  await board.close()
 }
 
 main()