change svg 0.5.5+1 to 0.5.4 fix#19
change svg 0.5.5+1 to 0.5.4 fix#19

CarGuo/GSYGithubAppFlutter,CarGuo/GSYGithubAppFlutter,CarGuo/GSYGithubAppFlutter,CarGuo/GSYGithubAppFlutter,CarGuo/GSYGithubAppFlutter