Allow text, add field, check for dict and append api_key

[fabaff]

Just a couple of changes related to #8 to get the upload working. Sorry, I'm not a ThingSpeak expert.

• Make id optional as it's not needed for updates
• Add the possibility to specify the field if one would send text
• Check if data is dict and api_key can be attached

My test case

import thingspeak
import random
import time

api_key = 'WRITE_API_KEY'
channel = thingspeak.Channel(api_key=api_key, timeout=5)

# Update a single field
channel.update({'field1': random.randrange(50, 60)})
time.sleep(20)
# Update multiple fields
channel.update({'field1': random.randrange(10, 20), 'field2': random.randrange(30, 50)})
time.sleep(20)
# Send text to field2
channel.update(random.randrange(20, 30), 2)

[fabaff]

Any news on this?

[mchwalisz]

This breaks the tests (even with the correct environment variables).

[marcelstoer]

# Send text to field2
channel.update(random.randrange(20, 30), 2)

Shouldn't the parameter order be inverted? As with any dictionary you should put the key first IMHO.