Use hexml package

[NelsonVides]

Let's start using our newly uploaded hex exml package

[codecov]

Codecov Report

Merging #3117 (029b15f) into master (2bc323d) will increase coverage by 2.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3117      +/-   ##
==========================================
+ Coverage   76.33%   79.19%   +2.86%     
==========================================
  Files         388      388              
  Lines       31846    31846              
==========================================
+ Hits        24309    25220     +911     
+ Misses       7537     6626     -911     

Impacted Files	Coverage Δ
src/ejabberd_local.erl	71.22% <0.00%> (-2.16%)	⬇️
src/muc_light/mod_muc_light.erl	83.69% <0.00%> (-0.86%)	⬇️
src/pubsub/mod_pubsub_db_mnesia.erl	92.40% <0.00%> (-0.43%)	⬇️
src/ejabberd_s2s_out.erl	57.89% <0.00%> (-0.23%)	⬇️
src/pubsub/mod_pubsub.erl	71.86% <0.00%> (-0.06%)	⬇️
src/ejabberd_c2s.erl	89.35% <0.00%> (+0.07%)	⬆️
src/mod_muc_room.erl	77.33% <0.00%> (+0.17%)	⬆️
src/global_distrib/mod_global_distrib_utils.erl	66.03% <0.00%> (+0.94%)	⬆️
src/mam/mod_mam_utils.erl	89.56% <0.00%> (+1.01%)	⬆️
src/ejabberd_sm.erl	83.38% <0.00%> (+1.01%)	⬆️
... and 16 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2bc323d...029b15f. Read the comment docs.

[arcusfelis]

ok