README.md update to link to releases page.

README.md

@@ -345,6 +345,18 @@ to executing the following command in your terminal shell:
    ```
    git clone https://github.com/flame/blis.git
    ```
+   At this point, you will have the latest commit of the `master` branch
+checked out. If you wish to check out a particular version x.y.z, execute
+the following:
+   ```
+   git checkout x.y.z
+   ```
+   `git` will then transform your working copy to match the state of the
+commit associated with version x.y.z. You can view a list of tags at any
+time by executing:
+   ```
+   git tag --list
+   ```
 
 2. **Download a source repository via a zip file.**
 If you are uncomfortable with using `git` but would still like the latest
@@ -356,8 +368,11 @@ This should reveal a link for downloading the zip file.
 
 3. **Download a source release via a tarball/zip file.**
 Alternatively, if you would like to stick to the code that is included in
-official releases, you may download either a tarball or zip file of any of
-BLIS's previous [tagged releases](https://github.com/flame/blis/tags).
+official releases, you may download either a tarball or zip file of BLIS's
+latest [release](https://github.com/flame/blis/releases). Some older releases
+are only available as [tagged](https://github.com/flame/blis/tags) commits.
+(Note: downloading release x.y.z is equivalent to downloading, or checking out,
+tag `x.y.z`.)
 We consider this option to be less than ideal for most people since it will
 likely mean you miss out on the latest bugfix or feature commits (in contrast
 to Options 1 or 2), and you also will not be able to update your code with a