Set default chunk size to 4 MiB

See prasmussen/google-api-go-client@01eb774

README.md

@@ -69,7 +69,7 @@ If you want to compile from source you need the go toolchain: http://golang.org/
                 --share     Share uploaded file
                 --mimetype  The MIME type (default will try to figure it out)
                 --convert   File will be converted to Google Docs format
-            -C, --chunksize Set chunk size in bytes. Minimum is 262144, default is 1048576. Recommended to be a power of two.
+            -C, --chunksize Set chunk size in bytes. Minimum is 262144, default is 4194304. Recommended to be a power of two.
         url:
             -i, --id        File Id (*)
             -p, --preview   Generate preview url (default)

drive.go

@@ -48,7 +48,7 @@ type Options struct {
 		Share     bool     `goptions:"--share, description='Share uploaded file'"`
 		MimeType  string   `goptions:"--mimetype, description='The MIME type (default will try to figure it out)'"`
 		Convert   bool     `goptions:"--convert, description='File will be converted to Google Docs format'"`
-		ChunkSize int64    `goptions:"-C, --chunksize, description='Set chunk size in bytes. Minimum is 262144, default is 1048576. Recommended to be a power of two.'"`
+		ChunkSize int64    `goptions:"-C, --chunksize, description='Set chunk size in bytes. Minimum is 262144, default is 4194304. Recommended to be a power of two.'"`
 	} `goptions:"upload"`
 
 	Download struct {