[EN-1335] installation instructions corrected

Author: iamishalkin

README.md

@@ -4,16 +4,16 @@ This library provides Python API to dxfeed via C API. The code is written in Pyt
 
 ## Installation
 
-**Requirements:** python >3.6, cython, pandas
+**Requirements:** python >3.6, pandas
 
 ```python
-pip3 install cython pandas
+pip3 install pandas
 ```
 
-Install package itself
+Install package via PyPI
 
 ```python
-pip3 install dxpyfeed-x.x.x.tar.gz
+pip3 install dxfeed
 ``` 
 
 ## Basic usage

docs/installation.rst

@@ -10,11 +10,11 @@ Installation
 
         pip3 install pandas
 
-The easiest way to install dxpyfeed is to use pip
+The easiest way to install dxfeed is to use pip
 
 .. code-block:: bash
 
-    pip3 install dxpyfeed-x.x.x.tar.gz
+    pip3 install dxfeed
 
 .. warning::
     Package is not available on MacOS for now