Added make uppercase support

[ppizarror]

• Implements uppercase and lowercase #33.

[codecov[bot]]

Codecov Report

Base: 98.44% // Head: 98.45% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (40de57a) compared to base (3fc7056). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #35 +/- ## ======================================= Coverage 98.44% 98.45% ======================================= Files 10 10 Lines 1741 1743 +2 ======================================= + Hits 1714 1716 +2 Misses 27 27 ``` | [Impacted Files](https://codecov.io/gh/ppizarror/PyDetex/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pablo+Pizarro+R.) | Coverage Δ | | |---|---|---| | [pydetex/parsers.py](https://codecov.io/gh/ppizarror/PyDetex/pull/35/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pablo+Pizarro+R.#diff-cHlkZXRleC9wYXJzZXJzLnB5) | `99.87% <100.00%> (+<0.01%)` | :arrow_up: | | [pydetex/version.py](https://codecov.io/gh/ppizarror/PyDetex/pull/35/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pablo+Pizarro+R.#diff-cHlkZXRleC92ZXJzaW9uLnB5) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pablo+Pizarro+R.). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Pablo+Pizarro+R.)

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