Update index.md (#199)

Fix a typo.

Author: pitmonticone

docs/src/index.md

@@ -5,6 +5,6 @@ Bringing [**Python®**](https://www.python.org/) and [**Julia**](https://juliala
 - Simple syntax, so the Python code looks like Python and the Julia code looks like Julia.
 - Intuitive and flexible conversions between Julia and Python: anything can be converted, you are in control.
 - Fast non-copying conversion of numeric arrays in either direction: modify Python arrays (e.g. `bytes`, `array.array`, `numpy.ndarray`) from Julia or Julia arrays from Python.
-- Helpful wrappers: interpret Python sequences, dictionaries, arrays, dataframes and IO streams as their Julia couterparts, and vice versa.
+- Helpful wrappers: interpret Python sequences, dictionaries, arrays, dataframes and IO streams as their Julia counterparts, and vice versa.
 - Beautiful stack-traces.
 - Works anywhere: tested on Windows, MacOS and Linux, 32- and 64-bit, Julia Julia 1.6.1 upwards and Python 3.7 upwards.