fix: lock deps to exact versions

[anjmao]

fixes #288

[MrMage]

I think I would prefer to only version-lock the packages that need it, and only as much as needed. So for now, I would only lock SwiftProtobuf to . upToNextMinor(from: "1.0.2") (see https://github.com/apple/swift-package-manager/blob/master/Documentation/PackageDescriptionV4.md).

Let me know if you think differently.

[anjmao]

@MrMage I think the most important thing is to ensure that grpc protoc plugin is used with the same version of swift grpc and swift protobuf. Currently this is how it looks:

https://github.com/grpc/grpc-swift/blob/master/SwiftGRPC.podspec#L44 In podspec version is
s.dependency 'SwiftProtobuf', '~> 1.0.3

In https://github.com/grpc/grpc-swift/blob/master/Package.swift#L21 version is from: 1.0.2

Since apple swift protobuf do not follow semver even having upToNextMinor(from: "1.0.2") can break things isn't it?

[MrMage]

Do you have any documentation on SwiftProtobuf‘s versioning? Haven’t been broken by revisions since 0.9, and i wouldn’t expect the 1.0 minor to receive any breaking changes in the future given that 1.1 is already out, but it might still receive bug fixes.

Also, if you desire consistency with the CocoaPods, we could use `.upToNextMinor(from: "1.0.3")’? The end result will be the same anyway.

[anjmao]

I don't have any documentation, but if you look:

1. Go to https://github.com/apple/swift-protobuf/releases
2. Check Directly generate equality (one less indirection) apple/swift-protobuf#781 which actually is a breaking change because if you are generating code with swift-protobuf 1.1.1 you will not be able to use it with SwiftProtobuf 1.0.3 library. This is a breaking change and version should be 2.0.0 if semver is followed.

If upToNextMinor(from: "1.0.3") is updates to 1.1.1 version then it's not good, otherwise you can make your changes and close this PR. Thanks 👍

[MrMage]

upToNextMinor should always stay below 1.1, so it should work. Why not just try it?

[anjmao]

Yes it works, I updated PR. Now swift protobuf is both 1.0.3 in code generation and pod library.