Update changelog in advance of release tag

Author: castastrophe

CHANGELOG-1.x.md

@@ -1,8 +1,8 @@
-# 1.5.0 (TBD)
+# 1.5.0 (2021-04-14)
 
 - [a1e4b67](https://github.com/patternfly/patternfly-elements/commit/a1e4b67ac012f5987e6cddf2cc7b532a135fa989) feat: Add CSS variable support for typography & background colors on tabs
 - [84cb0b1](https://github.com/patternfly/patternfly-elements/commit/84cb0b1ea257a33dc28954367e82771bb3e17a52) fix: Updated CSS to allow CSS custom properties to override dynamically calculated theme context
-- [](https://github.com/patternfly/patternfly-elements/commit/) feat: Add a new readtime component to display estimated time to read content
+- [bdc14f7](https://github.com/patternfly/patternfly-elements/commit/bdc14f7c5e0d1fa0bf23ec3911b7f0b745a310ea) feat: Add a new readtime component to display estimated time to read content
 
 
 # 1.4.0 (2021-03-30)