fix(chart): change source to sources in chart file

As a carryover from the days when we only allowed one source, the source
field was still labeled 'source' instead of 'sources'. Fixed and updated
all of the tests.

pkg/chart/chartfile.go

@@ -30,7 +30,7 @@ type Chartfile struct {
 	Version     string        `yaml:"version"`
 	Keywords    []string      `yaml:"keywords,omitempty"`
 	Maintainers []*Maintainer `yaml:"maintainers,omitempty"`
-	Source      []string      `yaml:"source,omitempty"`
+	Source      []string      `yaml:"sources,omitempty"`
 	Home        string        `yaml:"home"`
 }
 

pkg/chart/testdata/badchartversion/Chart.yaml

@@ -8,6 +8,6 @@ maintainers:
     email: helm@example.com
   - name: Someone Else
     email: nobody@example.com
-source:
+sources:
   - https://example.com/foo/bar
 home: http://example.com

pkg/chart/testdata/frobnitz/Chart.yaml

@@ -10,6 +10,6 @@ maintainers:
     email: helm@example.com
   - name: Someone Else
     email: nobody@example.com
-source:
+sources:
   - https://example.com/foo/bar
 home: http://example.com

pkg/chart/testdata/sprocket/Chart.yaml

@@ -10,6 +10,4 @@ maintainers:
   email: helm@example.com
 - name: Someone Else
   email: nobody@example.com
-source:
-- https://example.com/foo/bar
 home: http://example.com