Update constants.py

[niltonmelox]

add 'GBPJPY-OTC': 84 on constants

[codecov-io]

Codecov Report

Merging #181 into master will decrease coverage by 0.29%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #181     +/-   ##
=========================================
- Coverage   59.58%   59.28%   -0.3%     
=========================================
  Files          59       59             
  Lines        2056     2056             
=========================================
- Hits         1225     1219      -6     
- Misses        831      837      +6

Impacted Files	Coverage Δ
iqoptionapi/constants.py	100% <100%> (ø)	⬆️
tests/test_Candle.py	95.65% <0%> (-4.35%)	⬇️
tests/test_Binary_Option.py	97.14% <0%> (-2.86%)	⬇️
iqoptionapi/expiration.py	51.85% <0%> (-1.86%)	⬇️
iqoptionapi/ws/client.py	60.3% <0%> (-1.01%)	⬇️
iqoptionapi/stable_api.py	40.13% <0%> (-0.12%)	⬇️

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