TA Lib - Stochastic Indicator with FT sample strategies

[Prossi79]

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Step 2: Describe your environment

Operating system: Ubuntu 18.04
Python Version: 3.7.4
CCXT version: ccxt==1.27.91
Branch: Develop
Last Commit ID: b50d072

Step 3: Describe the problem:

TA lib indicator ta.STOCHF with FT sample strategies (e.g. Scalp, CofiBitStrategy ReinforcedSmoothScalp ...) not working anymore after update

Steps to reproduce:

1. ---

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Observed Results:

• What happened?
• What did you expect to happen?

Relevant code exceptions or logs:

2020-05-23 16:57:46,505 - freqtrade.optimize.backtesting - INFO - Running backtesting for Strategy ReinforcedQuickie
2020-05-23 16:57:48,393 - freqtrade.optimize.backtesting - INFO - Backtesting with data from 2020-01-01T00:00:00+00:00 up to 2020-05-15T00:00:00+00:00 (135 days)..
2020-05-23 16:57:49,170 - freqtrade.optimize.backtesting - INFO - Running backtesting for Strategy Scalp
2020-05-23 16:57:49,172 - freqtrade - ERROR - Fatal exception!
Traceback (most recent call last):
File "/home/andreas/freqtrade/freqtrade/main.py", line 36, in main
  return_code = args['func'](args)
File "/home/andreas/freqtrade/freqtrade/commands/optimize_commands.py", line 49, in start_backtesting
  backtesting.start()
File "/home/andreas/freqtrade/freqtrade/optimize/backtesting.py", line 390, in start
  preprocessed = self.strategy.ohlcvdata_to_dataframe(data)
File "/home/andreas/freqtrade/freqtrade/strategy/interface.py", line 502, in ohlcvdata_to_dataframe
  for pair, pair_data in data.items()}
File "/home/andreas/freqtrade/freqtrade/strategy/interface.py", line 502, in <dictcomp>
  for pair, pair_data in data.items()}
File "/home/andreas/freqtrade/freqtrade/strategy/interface.py", line 518, in advise_indicators
  return self.populate_indicators(dataframe, metadata)
File "/home/andreas/freqtrade/user_data/strategies/Scalp.py", line 46, in populate_indicators
  stoch_fast = ta.STOCHF(dataframe, 5.0, 3.0, 0.0, 3.0, 0.0)
File "talib/_abstract.pxi", line 398, in talib._ta_lib.Function.__call__
File "talib/_abstract.pxi", line 277, in talib._ta_lib.Function.set_function_args
File "talib/_abstract.pxi", line 462, in talib._ta_lib.Function.__check_opt_input_value
TypeError: Invalid parameter value for fastk_period (expected int, got float)

[hroff-1902]

moving it to freqtrade-strategies

[xmatthias]

You must update this (strategy) repository too.

It's related to the ta-lib update - and was fixed in #73 ... (as i knew that was comming ...)