[#67664082] Bump dropsonde version.

Move dropsonde example application to top level.

Signed-off-by: caleb miles <cmiles@pivotallabs.com>
[#67664082] Include development dependencies for example application

Signed-off-by: caleb miles <cmiles@pivotallabs.com>
[#67664082] Bump dropsonde version.

Signed-off-by: caleb miles <cmiles@pivotallabs.com>