fixed upload issue for directory with single file

[milanchandna]

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This checklist is used to make sure that common guidelines for a pull request are followed.

Description of the change

Fixed upload issue where destination filename was wrong while upload of directory with single file #208

General Guidelines

• [x ] The PR has modified HISTORY.rst with an appropriate description of the change and a version increment.
• [ x] The PR has supporting test coverage that confirm the expected behavior and protects against regressions, including necessary recordings.
• [ x] Links to associated bugs, if any, are in the description.

[coveralls]

Coverage increased (+0.02%) to 84.856% when pulling 1541144 on Uploader-SingleFile-Issue into 923cc64 on master.