docs: fix a few simple typos

[timgates42]

There are small typos in:

• README.md
• nearpy/filters/uniquefilter.py
• nearpy/filters/vectorfilter.py
• nearpy/hashes/permutation/hashpermutationmapper.py
• nearpy/hashes/permutation/hashpermutations.py
• nearpy/hashes/permutation/permutedIndex.py
• nearpy/hashes/randombinaryprojectiontree.py

Fixes:

• Should read separately rather than separatly.
• Should read tuples rather than tupes.
• Should read query rather than qurey.
• Should read lists rather than listst.
• Should read leaves rather than leafes.
• Should read implementation rather than implementatiosn.
• Should read exact rather than extact.
• Should read closest rather than cloest.

Closes #94