fixes: from from in the example given

[balajipachai]

What was wrong?

In the example Walking a full trie in the README file, from was used twice before trie.fog import HexaryTrieFog

Related to Issue # None
Closes # Fixes a typo in the README file, thus, ensuring that future learners don't encounter the below error:

>>> from from trie.fog import HexaryTrieFog
  File "<stdin>", line 1
    from from trie.fog import HexaryTrieFog
         ^^^^
SyntaxError: invalid syntax

How was it fixed?

Removed the extra from

Todo:

• [ Adds one commit ] Clean up commit history

• [ Not required ] Add or update documentation related to these changes

• [ Not needed] Add entry to the release notes

Cute Animal Picture

[kclowes]

Thanks!