Sheetfu

Fix
* **Range:** Enforce userEnteredFormat as a field mask ([`1e77f6b`](https://github.com/socialpoint-labs/sheetfu/commit/1e77f6b449d18b9ee7c6bffdd0d680db7d402494))

Feature
* Add formulas integration ([`590df68`](https://github.com/socialpoint-labs/sheetfu/commit/590df68221c580c33a0c5e4c564dca71e569aceb))
* **Range:** Add datetime python conversion ([`fe664b6`](https://github.com/socialpoint-labs/sheetfu/commit/fe664b614b6eb17bbe1b469fcc94efdc39be5ef9))
* **Item:** Add to_dict method to convert Item object to simple dictionary ([`210d10e`](https://github.com/socialpoint-labs/sheetfu/commit/210d10edd5ae4fafd289ca1683a211c28c5bca5c))

Fix
* PEP8 formatting ([`04a74f9`](https://github.com/socialpoint-labs/sheetfu/commit/04a74f9b657670be6aa1fe07ad802af78e071017))
* **Sheet:** Fixes missing sheet name in a1 notation when using get_range method ([`4770fb1`](https://github.com/socialpoint-labs/sheetfu/commit/4770fb142e4d4a19e18d4eff8899f58c673befeb))

Documentation
* Add datetime explanation in the README ([`cb21f86`](https://github.com/socialpoint-labs/sheetfu/commit/cb21f863ec29e05e03fa29393d5adf1ca43545d4))

Fix
* Remove ugly print ([`105ec78`](https://github.com/socialpoint-labs/sheetfu/commit/105ec78cf5c8de0d8fe7969829edc8e50aa58937))
* Dummy to test python semantic release ([`342d49d`](https://github.com/socialpoint-labs/sheetfu/commit/342d49d37800c7c0a3103aa06816cf14bb44fe6b))

Fix
* **Sheet:** Addng custom error when using row=0 or column=0 ([`a8f4f43`](https://github.com/socialpoint-labs/sheetfu/commit/a8f4f43b968880a9611b416ac8f38c8ad2ccb535))

Fix
* Update supported python versions (51) ([`d3b5a3a`](https://github.com/socialpoint-labs/sheetfu/commit/d3b5a3aa74aa5a9899ef984884fd8803f38ce09d))