Update fast_tls to 1.0.20 and cache_tab to 1.0.12

[fenek]

fast_tls 1.0.20 includes several improvements, including fixes for potential memory leaks.

It fixes "null ssl context" OpenSSL error observed in one of Docker-based environments:

2018-02-28 15:12:06 =CRASH REPORT====
  crasher:
    initial call: mod_global_distrib_receiver:init/1
    pid: <0.1002.0>
    registered_name: []
    exception error: {{badmatch,{error,<<"SSL_new failed: error:140BA0C3:SSL routines:SSL_new:null ssl ctx">>}},[{mod_global_distrib_receiver,init,1,[{file,"/tmp/mongooseim/_build/prod/lib/mongooseim/src/global_distrib/mod_global_distrib_receiver.erl"},{line,76}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}
    ancestors: [<0.628.0>,<0.627.0>,ranch_sup,<0.254.0>]
    message_queue_len: 0
    messages: []
    links: [<0.628.0>,#Port<0.17285>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 1598
    stack_size: 27
    reductions: 371
  neighbours:
2018-02-28 15:12:06 =ERROR REPORT====
Ranch listener {{172,21,1,1},5555} had connection process started with mod_global_distrib_receiver:start_link/4 at <0.1002.0> exit with reason: {{badmatch,{error,<<"SSL_new failed: error:140BA0C3:SSL routines:SSL_new:null ssl ctx">>}},[{mod_global_distrib_receiver,init,1,[{file,"/tmp/mongooseim/_build/prod/lib/mongooseim/src/global_distrib/mod_global_distrib_receiver.erl"},{line,76}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}

[codecov-io]

Codecov Report

Merging #1753 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1753      +/-   ##
==========================================
+ Coverage   74.55%   74.68%   +0.13%     
==========================================
  Files         283      283              
  Lines       26573    26573              
==========================================
+ Hits        19811    19846      +35     
+ Misses       6762     6727      -35

Impacted Files	Coverage Δ
...rc/global_distrib/mod_global_distrib_transport.erl	47.05% <0%> (-5.89%)	⬇️
src/mod_push_service_mongoosepush.erl	88.23% <0%> (-5.89%)	⬇️
src/mod_mam_muc_odbc_async_pool_writer.erl	70.73% <0%> (-3.26%)	⬇️
src/mongoose_client_api_sse.erl	75% <0%> (-3.13%)	⬇️
src/mod_bosh_socket.erl	80.66% <0%> (-1%)	⬇️
src/mod_roster.erl	78.92% <0%> (-0.25%)	⬇️
src/mod_pubsub.erl	66.01% <0%> (+0.06%)	⬆️
src/mod_muc.erl	69.25% <0%> (+0.27%)	⬆️
src/mod_mam.erl	89.43% <0%> (+0.37%)	⬆️
src/mod_muc_room.erl	77.24% <0%> (+0.77%)	⬆️
... and 5 more

---

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[arcusfelis]

ok