Added hashcoin to the app.yml example file.
Added hashcoin to the app.yml example file.

habibmasuro/altcoin-mining-calculator-php,n00bsys0p/altcoin-mining-calculator-php,framewr/altcoin-mining-calculator-php,framewr/altcoin-mining-calculator-php,habibmasuro/altcoin-mining-calculator-php,framewr/altcoin-mining-calculator-php,habibmasuro/altcoin-mining-calculator-php,n00bsys0p/altcoin-mining-calculator-php