chore(release): 20.11.0 (#1820) * chore(release): 20.11.0 * Update polkadot version

chore(release): 20.10.2 (#1816) * chore(release): 20.10.2 * Update docs

chore(release): 20.10.1 (#1806) 

chore(release): 20.10.0 (#1804) 

chore(release): 20.9.1 (#1792) 

chore(release): 20.9.0 (#1789) 

chore(release): 20.8.0 (#1781) 

20.7.3 (#1775) 

chore(release): 20.7.2 (#1769) * chore(release): 20.7.2 * build docs

chore(release): 20.7.1 (#1760) * chore(release): 20.7.1 * docs build