feat(travis): add GO 1.5

.travis.yml

@@ -1,5 +1,6 @@
 language: go
 go:
+  - 1.5
   - 1.4
   - 1.3
   - release

vips.go

@@ -65,7 +65,7 @@ func init() {
 }
 
 // Explicit thread-safe start of libvips.
-// Only call this function if you've previously shutdown libvips
+// Only call this function if you previously shutdown libvips
 func Initialize() {
 	if C.VIPS_MAJOR_VERSION <= 7 && C.VIPS_MINOR_VERSION < 40 {
 		panic("unsupported libvips version!")