Update README.md

README.md

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+# IVREGHDFE: reghdfe + ivreg2 (adds instrumental variable and additional robust SE estimators to reghdfe)
+![GitHub release (latest by date)](https://img.shields.io/github/v/release/sergiocorreia/ivreghdfe?label=last%20version)
+![GitHub Release Date](https://img.shields.io/github/release-date/sergiocorreia/ivreghdfe)
+![GitHub commits since latest release (by date)](https://img.shields.io/github/commits-since/sergiocorreia/ivreghdfe/latest)
+![StataMin](https://img.shields.io/badge/stata-%3E%3D%2012.1-blue)
+[![DOI](https://zenodo.org/badge/63449974.svg)](https://zenodo.org/badge/latestdoi/63449974)
+- Jump to: [`usage`](#usage) [`benchmarks`](#benchmarks) [`install`](#installation)
+
 This package integrates [`reghdfe`](https://github.com/sergiocorreia/reghdfe/) into [`ivreg2`](https://ideas.repec.org/c/boc/bocode/s425401.html), through an `absorb()` option. This allows IV/2SLS regressions with multiple levels of fixed effects.
 
 ## Recent updates