v5.5.2

Updates v5.5.2:

1) Old style link in MG811.ino file have been renewed (link redirect to the same address in both cases).

2) Cleaned extra spaces after the last line of the files.

3) The information file has been extensively updated.

4) .gitattributes file added.

The libraries were divided into five different subgroups in v5.0.0:

1) MQ series gas sensor library

2) TGS series gas sensor library

3) MG811 gas sensor library

4) SP3S-AQ2 gas sensor library

5) Geiger Counter library

This library was customized for MG811 gas sensor!