CHANGELOG.md: Fix MD034 warnings

The following warnings are generated by using markdownlint analysis:
```
MD034/no-bare-urls Bare URL used [Context: "https://github.com/openbmc/ope..."]
```
Refer to markdown-lint [1] to fix MD034
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/034-no-bare-urls.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I7e73269fd0eed59d2c3e79a7977853ffb6a5ac8f
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 50536bc..82c4311 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -411,7 +411,7 @@
    CI purposes. `oem-ibm` is still disabled by default in the `libpldm` bitbake
    recipe:
 
-   https://github.com/openbmc/openbmc/blob/master/meta-phosphor/recipes-phosphor/libpldm/libpldm_git.bb#L10
+   <https://github.com/openbmc/openbmc/blob/master/meta-phosphor/recipes-phosphor/libpldm/libpldm_git.bb#L10>
 
    To disable `oem-ibm` in your development builds, pass `-Doem-ibm=disabled`
    when invoking `meson setup`