add support for symbols query param

[thejchap]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 220

• 8 of 9 (88.89%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-4.4%) to 95.588%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/money/bank/open_exchange_rates_bank.rb	8	9	88.89%

Files with Coverage Reduction	New Missed Lines	%
lib/money/bank/open_exchange_rates_bank.rb	2	97.01%

Totals
Change from base Build 219:	-4.4%
Covered Lines:	130
Relevant Lines:	136

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 220

• 8 of 9 (88.89%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-4.4%) to 95.588%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/money/bank/open_exchange_rates_bank.rb	8	9	88.89%

Files with Coverage Reduction	New Missed Lines	%
lib/money/bank/open_exchange_rates_bank.rb	2	97.01%

Totals
Change from base Build 219:	-4.4%
Covered Lines:	130
Relevant Lines:	136

---

💛 - Coveralls

[spk]

Hi @thejchap sorry for the delay there is rubocop offence on source_url but I will fix it on another commit thanks