Remove tiny typo

Excuse the small PR, I just saw the typo while browsing through the documentation.

response format handling and minor other things

account.py: use only Discussions_by_* for blog/comment history, improving condenser API compatibility

* Fix non ascii text handling on some nodes
* Add STEEM_REVERSE_AUCTION_WINDOW_SECONDS_HF21 constant
* Fix get_curation_rewards

Scheduled weekly dependency update for week 34

Add support for Pulsar to be used in future EFTG iterations

* add options use_tags_api to use database api to get comments
* fix get_similar_account_names
* add more try expect to fail back to condenser api

* operations for account_update2, create_proposal, update_proposal_votes and remove_proposal were added
* update_proposal_votes was added to steem
* update_account_jsonmetadata was added to account
* new beempy delete were added

Switch to next node when ApiNotSupported and node returns Client returned invalid format. Expected JSON!
* enforce utf-8 on node reply parser

* The vote operation is now available at the steem object
* A vote wrapper function with the old syntax is available at comment
* The upvote and downvote at the cli (beempy) has now one argument, the weight must specified by --weight or -w

* comment.downvote(100) will now downvote with 100 %

Scheduled weekly dependency update for week 26

fixes compatibility issues with WhaleShares HF2 / v2.5

improve permlink derivation