Update README.md

protos/README.md

@@ -3,10 +3,8 @@
 ## Contents
 
 - helloworld.proto
-  A very simple example used in the overview.
-
+  - A very simple example used in the overview.
 - stock.proto
-  A detailed example that's described in detail in the tutorial.
-
+  - A detailed example that's described in detail in the tutorial.
 - math.proto
-  Another detailed example for further reference.
+  - Another detailed example for further reference.