Separate sections in gitignore by blank line

This improves readability of gitignore a bit.

.gitignore

@@ -1,27 +1,33 @@
 # Prerequisites
 *.d
+
 # Object files
 *.o
 *.ko
 *.obj
 *.elf
+
 # Linker output
 *.ilk
 *.map
 *.exp
+
 # Precompiled Headers
 *.gch
 *.pch
+
 # Libraries
 *.lib
 *.a
 *.la
 *.lo
+
 # Shared objects (inc. Windows DLLs)
 *.dll
 *.so
 *.so.*
 *.dylib
+
 # Executables
 *.exe
 *.out
@@ -29,11 +35,13 @@
 *.i*86
 *.x86_64
 *.hex
+
 # Debug files
 *.dSYM/
 *.su
 *.idb
 *.pdb
+
 # Kernel Module Compile Results
 *.mod*
 *.cmd