fix typo in readme.md with pypi installation (#1106)

Author: Alexander-Makaryev

README.md

@@ -29,7 +29,7 @@ cd dpnp
 ## Install Wheel Package from Pypi
 Install DPNP
 ```cmd
-python -m pip install --index-url https://pypi.anaconda.org/intel/simple -extra-index-url https://pypi.org/simple dpnp
+python -m pip install --index-url https://pypi.anaconda.org/intel/simple --extra-index-url https://pypi.org/simple dpnp
 ```
 Note: DPNP wheel package is placed on Pypi, but some of its dependencies (like Intel numpy) are in Anaconda Cloud.
 That is why install command requires additional intel Pypi channel from Anaconda Cloud.