title: kong Error when run it : don't know how to auth: 10
body: <p>I want to set up the <a href="https://konghq.com/" rel="nofollow noreferrer">Kong API gateway</a> version 2.2.1  .</p>
  <p>I installed Postgres version 13.1. but when I want to start Kong, this error shows up  :</p>
  <pre><code> [root@ip208 kong]# kong start -c kong.conf 
  Error: don't know how to auth: 10
  
    Run with --v (verbose) or --vv (debug) for more details
  </code></pre>
  <p>I test it  with --v  :</p>
  <pre><code>[root@ip208 kong]# kong start -c kong.conf --v
  2020/12/27 02:41:44 [verbose] Kong: 2.2.1
  2020/12/27 02:41:44 [verbose] reading config file at kong.conf
  2020/12/27 02:41:44 [verbose] prefix in use: /usr/local/kong
  Error: 
  /usr/local/share/lua/5.1/pgmoon/init.lua:211: don't know how to auth: 10
  stack traceback:
      [C]: in function 'auth'
      /usr/local/share/lua/5.1/pgmoon/init.lua:211: in function 'connect'
      .../share/lua/5.1/kong/db/strategies/postgres/connector.lua:211: in function 'connect'
      .../share/lua/5.1/kong/db/strategies/postgres/connector.lua:527: in function 'query'
      .../share/lua/5.1/kong/db/strategies/postgres/connector.lua:279: in function 'init'
      /usr/local/share/lua/5.1/kong/db/init.lua:141: in function 'init_connector'
      /usr/local/share/lua/5.1/kong/cmd/start.lua:31: in function 'cmd_exec'
      /usr/local/share/lua/5.1/kong/cmd/init.lua:88: in function &lt;/usr/local/share/lua/5.1/kong/cmd/init.lua:88&gt;
      [C]: in function 'xpcall'
      /usr/local/share/lua/5.1/kong/cmd/init.lua:88: in function &lt;/usr/local/share/lua/5.1/kong/cmd/init.lua:45&gt;
      /usr/local/bin/kong:9: in function 'file_gen'
      init_worker_by_lua:49: in function &lt;init_worker_by_lua:47&gt;
      [C]: in function 'xpcall'
      init_worker_by_lua:56: in function &lt;init_worker_by_lua:54&gt;
  
  </code></pre>