Bump httpie from 1.0.2 to 1.0.3 (#2397)

Bumps [httpie](https://github.com/jakubroztocil/httpie) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/jakubroztocil/httpie/releases)
- [Changelog](https://github.com/jakubroztocil/httpie/blob/master/CHANGELOG.rst)
- [Commits](httpie/cli@1.0.2...1.0.3)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -43,7 +43,7 @@ google-cloud-core==1.0.3
 google-cloud-storage==1.18.0
 google-resumable-media==0.3.2
 googleapis-common-protos==1.6.0
-httpie==1.0.2
+httpie==1.0.3
 httplib2==0.13.1
 idna==2.8
 inflection==0.3.1