fix get_account_history may terminate early #168

[takaaki7]

Fix get_account_history and get_account_history_operations don't return 1.11.0 because it is used as sentinel value in this line. (#168)
As stated in #168, fundamentally the operation 1.11.0 shouldn't be used as sentinel value, but just API fix is deployable.

For the current blockchain, 1.11.0 is the first operation of this transaction(cryptofresh) and owner is 1.1090.
I tested following queries return 1.11.0 correctly.

curl -u bytemaster:supersecret --data '{"jsonrpc": "2.0", "params": ["history", "get_account_history", ["1.2.1090", "1.11.0", 30, "1.11.30"]], "method": "call", "id": 10}' http://localhost:8090/rpc
curl -u bytemaster:supersecret --data '{"jsonrpc": "2.0", "params": ["history", "get_account_history_operations", ["1.2.1090", 11, "1.11.50", "1.11.0", 50]], "method": "call", "id": 10}' http://localhost:8090/rpc

[abitmore]

Looks good.

[oxarbitrage]

well done, i tested it and works good, a small change in the commands provided, need to do it as:

curl -u bytemaster:supersecret --data '{"jsonrpc": "2.0", "params": ["history", "get_account_history", ["1.2.1090", "1.11.0", 50, "1.11.30"]], "method": "call", "id": 10}' http://localhost:8090/rpc

in order to get up to 1.11.0, provided commands will end in 1.11.1. test case also works good.

i am merging the pull and closing the issue at #168