Update README.md
Merge pull request #1 from Maatwebsite/develop

* Selecting columns fix
Update README.md
Merge pull request #4 from Maatwebsite/develop

+ Store to server
Update README.md
Update README.md
Merge pull request #6 from Maatwebsite/develop

+ Autosize HTML columns, + Styling for HTML to XLS
Update README.md
Update README.md
Date formatting fix issue #7
++ Freeze or lock rows and columns ++
Merge pull request #8 from hicode/master

++ Freeze or lock rows and columns ++
Fix setFreeze method error
Freeze rows and columns methods
++ Set cell borders ++
++
+ Set cell borders
fix
+ Added two practical methods: setAutoFilter() and setColumnFormat()
Fix