Project dependencies may have API risk issues

Hi, In **Momentum-Trading-Example**, inappropriate dependency versioning constraints can cause risks.

Below are the dependencies and version constraints that the project is using

```
alpaca-trade-api>=0.25
ta
sklearn
```

The version constraint **==** will introduce the risk of dependency conflicts because the scope of dependencies is too strict.
The version constraint **No Upper Bound** and **\*** will introduce the risk of the missing API Error because the latest version of the dependencies may remove some APIs.

After further analysis, in this project,
The version constraint of dependency **ta** can be changed to *>=0.1.2,<=0.4.7*.
The version constraint of dependency **ta** can be changed to *>=0.7.0,<=0.10.2*.

The above modification suggestions can reduce the dependency conflicts as much as possible,
and introduce the latest version as much as possible without calling Error in the projects.

The invocation of the current project includes all the following methods.

The calling methods from the ta

ta.macd

The calling methods from the all methods

datetime.datetime.today.astimezone.replace

int

api.polygon.all_tickers

get_1000m_history_data.dropna

str

open_orders.get

alpaca_trade_api.StreamConn.run

alpaca_trade_api.REST.get_calendar

alpaca_trade_api.REST.submit_order

time.sleep

alpaca_trade_api.REST.get_account

datetime.datetime.today

run

symbol.minute_history.dropna

api.polygon.historic_agg

datetime.datetime.today.astimezone

run_ws

datetime.timedelta

existing_order.submitted_at.astimezone

minute_history.dropna.resample

len

alpaca_trade_api.REST.cancel_order

get_1000m_history_data

partial_fills.get

format

print

alpaca_trade_api.REST.get_position

alpaca_trade_api.StreamConn.on

alpaca_trade_api.REST.list_assets

market_open.astimezone.astimezone

ta.macd

find_stop

alpaca_trade_api.REST.list_orders

positions.get

pytz.timezone

alpaca_trade_api.StreamConn.close

alpaca_trade_api.StreamConn.deregister

requests.session

alpaca_trade_api.REST

alpaca_trade_api.REST.list_positions

numpy.where

float

numpy.diff

minute_history.dropna.resample.min

nyc.datetime.today.astimezone.strftime

alpaca_trade_api.StreamConn

ubound.lbound.symbol.minute_history.max

now.floor

get_tickers

symbols.remove

market_close.astimezone.astimezone

@developer
Could please help me check this issue?
May I pull a request to fix it?
Thank you very much.