README.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/doc...";]
```
Refer to markdown-lint [1] to fix MD034
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/034-no-bare-urls.md

Change-Id: Ie52ad8b4f15261f18d8a1e6029caefcc84ec51d8
Signed-off-by: George Liu <liuxiwei@ieisystem.com>
diff --git a/README.md b/README.md
index b7be655..8ae184c 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 # Design Doc for dbus-top
 
-Author: Adedeji Adebisi (ziniblessed@google.com)
+Author: Adedeji Adebisi <ziniblessed@google.com>
 
 Primary Assignee: Adedeji Adebisi
 
-Other contributors: Sui Chen (suichen@google.com) Alex Qiu (xqiu@google.com)
+Other contributors: Sui Chen <suichen@google.com>, Alex Qiu <xqiu@google.com>
 
 Created: May 17, 2021