Merge pull request #72 from LucaMingarelli/enrich_readme

Add info badges to readme

README.md

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 # fredapi: Python API for FRED (Federal Reserve Economic Data)
 
+[![Build and test GitHub](https://github.com/mortada/fredapi/actions/workflows/main.yml/badge.svg)](https://github.com/mortada/fredapi/actions)
+[![version](https://img.shields.io/badge/version-0.5.1-success.svg)](#)
+[![PyPI Latest Release](https://img.shields.io/pypi/v/fredapi.svg)](https://pypi.org/project/fredapi/)
+[![Downloads](https://static.pepy.tech/personalized-badge/fredapi?period=total&units=international_system&left_color=grey&right_color=blue&left_text=Downloads)](https://pepy.tech/project/fredapi)
+
 `fredapi` is a Python API for the [FRED](http://research.stlouisfed.org/fred2/) data provided by the
 Federal Reserve Bank of St. Louis. `fredapi` provides a wrapper in python to the 
 [FRED web service](http://api.stlouisfed.org/docs/fred/), and also provides several convenient methods