Add v0.5.0 release notes

docs/releases/v0.5.0.md

@@ -0,0 +1,14 @@
+---
+title: v0.5.0
+weight: 5000
+---
+
+ * reduce number of GitHub API requests
+ * add `--export` option for machine-parseable metadata about downloads
+ * add `--verify-checksum` option to control checksum behavior
+ * add `--list` flag for listing all matched resources instead of performing downloads
+ * add `--no-download` flag to stop before performing downloads
+ * add `--no-progress` flag to avoid live-updating progress output for basic TTYs
+ * add `--fail-fast` flag to interrupt and immediately stop downloads when a failure is detected
+ * fix error reporting on interrupted or failed downloads
+ * deprecate `--show-ref` (replaced by `--export`) and `--show-resources` (replaced by `--list`)