Snapshot
* impoved and STEEM and SBD history added
* Documentation added
* get_data, reset, build functions added

fix SteemConnect TransactionBuilder example

Fixes #42

Add vit to known_formats

Snapshot added
* This class can be used to access old account states. At the moment, only changes in vests are tracked over time.
* example added for plotting SP over time

Steem
* last_node added and refresh of json_config data is forced on node switch

* Update nodes in Nodelist
* Disable seed.bitcoiner.me node

Relase nodes for 0.19.45 added

Example
* A cache performance evalution script was added to examples
Blockchain
* set_cache_auto_clean disabled

reworking account.estimate_virtual_op_num

Fixes #36. More reliable convergence and therefore less RPC calls.

Scheduled weekly dependency update for week 26

Add VIT to known_chains

Missing Account import
Thank you for the correction!

Scheduled weekly dependency update for week 25

Discussions
* Examples added to all classes
* Discussions add for fetching more than 100 posts

estimate_virtual_op_count: avoid division by zero

Fixes #34