Added const GET_PARAM_EX2

[Abrosimov-a-a]

Исправление для: #44

К сожалению, не могу сейчас проверить вариант с GET_PARAM_EX_2, c GET_PARAM_EX2 - работает.

[coveralls]

Pull Request Test Coverage Report for Build 125

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 43.81%

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Totals
Change from base Build 121:	0.0%
Covered Lines:	138
Relevant Lines:	315

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💛 - Coveralls

[Abrosimov-a-a]

Готово.