Clarify Gyazo deprecation warning to use text response
Clarify Gyazo deprecation warning to use text response

It is a little unclear what the deprecation warning wants the developer
to do. The fallthrough comment to text response may not be immediately
obvious to the reader.

This commit helps to understand the intention and to avoid bugs such as
commit daac77a.

alucard0134/Pomf,pomf/pomf,pomf/pomf,alucard0134/Pomf,ewhal/gpomf,pomf/pomf-php,alucard0134/Pomf