message: README: Fix Etsy logo and alt text.
diff: @@ -127,7 +127,7 @@ $ gdb run
  # Companies Using Tantivy
  <p align="left">
  -<img align="center" src="doc/assets/images/Etsy.png" alt="Nuclia" height="25" width="auto" />&nbsp;
  +<img align="center" src="doc/assets/images/etsy.png" alt="Etsy" height="25" width="auto" />&nbsp;
  <img align="center" src="doc/assets/images/Nuclia.png#gh-light-mode-only" alt="Nuclia" height="25" width="auto" /> &nbsp;
  <img align="center" src="doc/assets/images/humanfirst.png#gh-light-mode-only" alt="Humanfirst.ai" height="30" width="auto" />
  <img align="center" src="doc/assets/images/element.io.svg#gh-light-mode-only" alt="Element.io" height="25" width="auto" />
  