Bump botocore from 1.10.63 to 1.10.64 (#296)

Bumps [botocore](https://github.com/boto/botocore) from 1.10.63 to 1.10.64.
- [Release notes](https://github.com/boto/botocore/releases)
- [Changelog](https://github.com/boto/botocore/blob/develop/CHANGELOG.rst)
- [Commits](boto/botocore@1.10.63...1.10.64)

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 asn1crypto==0.24.0
 auth0-python==3.3.0
 boto3==1.7.63
-botocore==1.10.63
+botocore==1.10.64
 cachetools==2.1.0
 certifi==2018.4.16
 cffi==1.11.5