Merge pull request #9 from artemshitov/fix-single-operation

Added a check whether raw ops are a Hash or Array

Closes #8
Merge branch 'master' of github.com:artemshitov/russianpost
v0.4.2
Revert "v0.4.2"

This reverts commit 5f0dca86c64225efc8fdd48ce815466955468f78.