Update CODEOWNERS

Add @schmidt-sebastian to database codeowners

Author: jshcrowthe

.github/CODEOWNERS

@@ -12,8 +12,8 @@
 # You can also use email addresses if you prefer.
 
 # Database Code
-src/database  @mikelehen @jdimond
-tests/database  @mikelehen @jdimond
+src/database  @mikelehen @jdimond @schmidt-sebastian
+tests/database  @mikelehen @jdimond @schmidt-sebastian
 
 # Storage Code
 src/storage  @sphippen
@@ -24,4 +24,4 @@ src/messaging  @gauntface
 tests/messaging  @gauntface
 
 # Auth Code
-src/auth.build.js  @bojeil-google
+src/auth.build.js  @bojeil-google