Update README add Debian releases
<td>
<a href="https://anaconda.org/bioconda/macs2">
<img src="https://img.shields.io/conda/v/bioconda/macs2" alt="latest release" />
+ </a>
<img src="https://img.shields.io/conda/pn/bioconda/macs2" alt="platform" />
+ </td>
+</tr>
+<tr>
+ <td></td>
+ <td>
+ <a href="https://packages.debian.org/buster/macs">
+ <img src="https://img.shields.io/debian/v/macs/stable?label=debian%20%28stable%29" alt="lastest release stable" />
+ </a>
+ <a href="https://packages.debian.org/sid/macs">
+ <img src="https://img.shields.io/debian/v/macs/sid?label=debian%20%28sid%29" alt="latest release unstable" />
</a>
</td>
</tr>
