Proto file is not re-generated

[vchekan]

Describe the bug
Sometimes proto files are not re-generated.

To Reproduce
Steps to reproduce the behavior:
I've opened example-sdk/example2 solution and compiled it. Then added a field to bundle.proto and recompiled project. I've got an error about missing member as expected, because I have not corrected .cs code. Then I've removed the filed I've added to proto file (i.e. restored original .proto) and recompiled the project. Error remained and output suggested proto file was not recompiled.

Expected behavior
Proto file should be recompiled and error should be gone.

Environement (please complete the following information):

• OS: windows
• Framework dotnetcore-2.1

[enricosada]

Closing, fixed with #98

added test suite/sdk integration/check regen if proto file is changed