`limit` and `offset` arguments do not work in `PySendPulse.get_emails_from_addressbook`

[anatolyrr]

The function returns the same result no matter the values.

api_id = ...
api_secret = ...
address_book_id = ...

api = PySendPulse(api_id, api_secret, storage_type="FILE", token_file_path=...)

# These all return the same result:
api.get_emails_from_addressbook(address_book_id, limit=1, offset=0)
api.get_emails_from_addressbook(address_book_id, limit=10, offset=0)
api.get_emails_from_addressbook(address_book_id, limit=10, offset=10)

Investigation showed that the most probable reason is that PySendPulse.__send_request serializes
params to json for any method:

sendpulse-rest-api-python/pysendpulse/pysendpulse.py

Line 148 in bbbcd87

params = json.dumps(params)

whereas address books emails api endpoint seems to expect normal GET-params now:

import json
import requests

token = ...
address_book_id = ...

url = f"https://api.sendpulse.com/addressbooks/{address_book_id}/emails"

headers = {
    'Authorization': f'Bearer {token}',
    'Content-Type': 'application/json'
}

params = { 'limit': 10, 'offset': 0 }

# This returns 10 emails, as expected
response = requests.get(url, headers=headers, params=params)
print(len(response.json()))

# This returns 100 emails, not as expected:
response = requests.get(url, headers=headers, params=json.dumps(params))
print(len(response.json()))