make bold text into headers and note anaconda

README.md

@@ -5,13 +5,20 @@ downloads and prepares various mnist-compatible datasets.
 files are downloaded to `~/.mnist`
 and checked for integrity by SHA-256 hashes.
 
-**dependencies:** python 3.6 (or later), numpy.
+### dependencies
 
-**install:** `pip install --upgrade --upgrade-strategy only-if-needed 'https://github.com/notwa/mnists/tarball/master#egg=mnists'`
+python 3.6 (or later), numpy.
+
+### install
+
+`pip install --upgrade --upgrade-strategy only-if-needed 'https://github.com/notwa/mnists/tarball/master#egg=mnists'`
 
 I've added `--upgrade-strategy` to the command-line
 so you don't accidentally "upgrade" numpy to
 a version not compiled specifically for your system.
+This can happen when using e.g. [Anaconda.][anaconda]
+
+[anaconda]: //www.anaconda.com/
 
 ## usage