add logo to conda and pypi badges

README.md

@@ -20,10 +20,10 @@
 <img src="https://results.pre-commit.ci/badge/github/SciTools/iris/master.svg"
      alt="pre-commit.ci status" /></a>
 <a href="https://anaconda.org/conda-forge/iris">
-<img src="https://img.shields.io/conda/v/conda-forge/iris?color=orange&label=conda-forge%7Ciris"
+<img src="https://img.shields.io/conda/v/conda-forge/iris?color=orange&label=conda-forge%7Ciris&logo=conda-forge&logoColor=white"
      alt="conda-forge" /></a>
 <a href="https://pypi.org/project/scitools-iris">
-<img src="https://img.shields.io/pypi/v/scitools-iris?color=orange&label=pypi%7Cscitools-iris"
+<img src="https://img.shields.io/pypi/v/scitools-iris?color=orange&label=pypi%7Cscitools-iris&logo=python&logoColor=white"
      alt="pypi" /></a>
 <a href="https://github.com/SciTools/iris/releases">
 <img src="https://img.shields.io/github/v/release/scitools/iris"