Merge pull request #2 from PavelSapachev/master

some bugfix and new features
Add missing `SET` in a query string concatenation

`SET` in missing in update function which makes it broken
Merge pull request #3 from RafLeszczynski/patch-1

Add missing `SET` in a query string concatenation
Merge pull request #1 from Serhioromano/master

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