Guatemalan currency support

[monroy95]

Fixes # by...

Guatemalan currency support

Changes proposed in this pull request:

modified: tests/test_es_gt.py
modified: num2words/lang_ES_GT.py
modified: num2words/lang_ES.py
modified: num2words/__init__.py

Status

• READY
• HOLD
• [] WIP (Work-In-Progress)

How to verify this change

>>> from num2words import num2words
>>> num2words(3443534.23, to='currency', lang='es', currency='GTQ')
'tres millones cuatrocientos cuarenta y tres mil quinientos treinta y cuatro quetzales con veintitrés centavos'
>>> num2words(458.51, to='currency', lang='es', currency='GTQ')
'cuatrocientos cincuenta y ocho quetzales con cincuenta y un centavos'
>>>

Additional notes

If applicable, explain the rationale behind your change.

[coveralls]

Coverage: 97.397% (+0.007%) from 97.389% when pulling 21e68f2 on monroy95:gt-currency into be6b2df on savoirfairelinux:master.