Fix Command Generator Location of Simple Example

[walidamriou]

This pull request addresses the issue of the command generator location.

The change involves updating the command used for code generation from ../../generator-bin/protoc --nanopb_out=. simple.proto to ../../generator/protoc --nanopb_out=. simple.proto .

[PetteriAimonen]

Which platform is this for? Considering the makefile works for Linux (and OS X, BSD etc. even though readme doesn't say that) directly.

On Windows I guess it will work, if there is a suitable Python installation with necessary packages. Otherwise the binary package would be easier on Windows.

[walidamriou]

This update effect README.txt only, the path of protoc is ../../generator/protoc --nanopb_out=. simple.protonot ../../generator-bin/protoc --nanopb_out=. simple.proto in examples/simple/README.txt

Tested in Windows

[PetteriAimonen]

In the Windows binary packages, there is generator-bin/protoc instead. But yeah, it's not clear which would be better in the README.

[walidamriou]

It's perfectly fine now. This is what I observed when using the master branch directly.

It's possible that if I use the Windows binary packages, the experience might be different.