Fix for incorrect 2010 solution

src/ProtocolBuffers.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
-
+
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "proto", "proto", "{1F896D5C-5FC2-4671-9216-781CB8187EC7}"
 	ProjectSection(SolutionItems) = preProject
 		..\protos\tutorial\addressbook.proto = ..\protos\tutorial\addressbook.proto