<p>Fix some typos in README and remove duplicate reference to dev mailing list.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/osm2pgsql/pull/509'>https://github.com/openstreetmap/osm2pgsql/pull/509</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Readme updates.</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/509/files#diff-0">README.md</a>
    (11)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/509.patch'>https://github.com/openstreetmap/osm2pgsql/pull/509.patch</a></li>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/509.diff'>https://github.com/openstreetmap/osm2pgsql/pull/509.diff</a></li>
</ul>

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