Make README intro more succinct (#54)

README.md

@@ -1,19 +1,15 @@
 # changelist
 
-Changelist helps you write better release notes by automating as much of the
-process as possible. For example, see
+A tool that automates release note generation.
+
+For example, see
 https://github.com/scientific-python/changelist/blob/main/CHANGELOG.md.
 
 **Features**
 
-- Compile a list of pull requests, code authors and reviewers between any two
-  valid Git objects (refs).
+- Compile a list of pull requests, code authors, and reviewers between
+  two given git commits.
 - Categorize pull requests into sections based on GitHub labels.
-- Point it at any repository on GitHub. No need to clone or checkout a
-  repository locally, a Python package is all that's needed.
-
-We recommend to treat the generated document as a first draft to build
-on and not as an already perfect documentation of the release.
 
 _This project is currently in its alpha stage and might be incomplete or change a lot!_