Removing `node-fetch` as a dependency. Adding disclaimer at README.

[leonelsanchesdasilva]

https://github.com/DesignLiquido/xslt-processor/issues/104 aftermath.

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	78.71% (-0.03% 🔻)	2359/2997
🟡	Branches	68.5% (-0.21% 🔻)	696/1016
🟡	Functions	75.45%	292/387
🟡	Lines	78.79% (-0.03% 🔻)	2151/2730

Show files with reduced coverage 🔻

|

St.^{:grey_question:}

| File | Statements | Branches | Functions | Lines | | :-: | :- | :- | :- | :- | :- | | 🟢 | xslt/xslt.ts |

81.34% (-0.19% 🔻)

|

64.57% (-0.76% 🔻)

| 87.5% |

80.39% (-0.2% 🔻)

|

Test suite run success

80 tests passing in 24 suites.

Report generated by 🧪jest coverage report action from 22c9e38bc3dedf584c780accadf441bbfaeb1caa