Consistently call functions

projects/interfaces/README.md

@@ -46,8 +46,8 @@ The first task is to implement unit tests for this type.
 You should write unit tests which show at least the following (you can write more if you want!):
 * If you make a buffer named `b` containing some bytes, calling `b.Buffer()` returns the same bytes you created it with.
 * If you write some extra bytes to that buffer using `b.Write()`, a call to `b.Buffer()` returns both the initial bytes and the extra bytes.
-* If you call `b.Read` with a slice big enough to read all of the bytes in the buffer, all of the bytes are read.
-* If you call `b.Read` with a slice smaller than the contents of the buffer, some of the bytes are read. If you call it again, the next bytes are read.
+* If you call `b.Read()` with a slice big enough to read all of the bytes in the buffer, all of the bytes are read.
+* If you call `b.Read()` with a slice smaller than the contents of the buffer, some of the bytes are read. If you call it again, the next bytes are read.
 
 ### Implementing our own `bytes.Buffer`