When parsing project.toml, don't warn about unexpected keys that are actually expected

pkg/project/project_test.go

@@ -403,7 +403,6 @@ name = "licenses should have either a type or uri defined"
 
 		it("should warn when unsupported keys, on tables the project owns, are declared with schema v0.1", func() {
 			projectToml := `
-# try to use some schema 0.2 configuration with 0.1 version - warning message expected
 [project]
 authors = ["foo", "bar"]
 
@@ -427,13 +426,15 @@ foo = "bar"
 
 			_, err = ReadProjectDescriptor(tmpProjectToml.Name(), logger)
 			h.AssertNil(t, err)
-			h.AssertContains(t, readStdout(), "Warning: The following keys declared in project.toml are not supported in schema version 0.1:\nWarning: - project.authors\nWarning: - io.buildpacks.build.env\nWarning: - io.buildpacks.build.env.name\nWarning: - io.buildpacks.build.env.value\nWarning: The above keys will be ignored. If this is not intentional, try updating your schema version.\n")
+			h.AssertContains(t, readStdout(), "Warning: The following keys declared in project.toml are not supported in schema version 0.1:\nWarning: - io.buildpacks.build.env\nWarning: - io.buildpacks.build.env.name\nWarning: - io.buildpacks.build.env.value\nWarning: The above keys will be ignored. If this is not intentional, try updating your schema version.\n")
 		})
 
 		it("should warn when unsupported keys, on tables the project owns, are declared with schema v0.2", func() {
 			projectToml := `
 [_]
 schema-version = "0.2"
+id = "foo"
+version = "bar"
 # typo in a key under valid table - warning message expected
 versions = "0.1"
 

pkg/project/types/types.go

@@ -33,10 +33,13 @@ type Build struct {
 }
 
 type Project struct {
-	Name      string    `toml:"name"`
-	Version   string    `toml:"version"`
-	SourceURL string    `toml:"source-url"`
-	Licenses  []License `toml:"licenses"`
+	ID               string    `toml:"id"`
+	Name             string    `toml:"name"`
+	Version          string    `toml:"version"`
+	Authors          []string  `toml:"authors"`
+	DocumentationURL string    `toml:"documentation-url"`
+	SourceURL        string    `toml:"source-url"`
+	Licenses         []License `toml:"licenses"`
 }
 
 type License struct {

pkg/project/v02/project.go

@@ -28,10 +28,15 @@ type Env struct {
 }
 
 type Project struct {
-	Name          string                 `toml:"name"`
-	Licenses      []types.License        `toml:"licenses"`
-	Metadata      map[string]interface{} `toml:"metadata"`
-	SchemaVersion string                 `toml:"schema-version"`
+	SchemaVersion    string                 `toml:"schema-version"`
+	ID               string                 `toml:"id"`
+	Name             string                 `toml:"name"`
+	Version          string                 `toml:"version"`
+	Authors          []string               `toml:"authors"`
+	Licenses         []types.License        `toml:"licenses"`
+	DocumentationURL string                 `toml:"documentation-url"`
+	SourceURL        string                 `toml:"source-url"`
+	Metadata         map[string]interface{} `toml:"metadata"`
 }
 
 type IO struct {