Bump github.com/BurntSushi/toml from 0.3.1 to 0.4.1

Bumps [github.com/BurntSushi/toml](https://github.com/BurntSushi/toml) from 0.3.1 to 0.4.1.
- [Release notes](https://github.com/BurntSushi/toml/releases)
- [Commits](https://github.com/BurntSushi/toml/compare/v0.3.1...v0.4.1)

---
updated-dependencies:
- dependency-name: github.com/BurntSushi/toml
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/BurntSushi/toml/deprecated.go

@@ -0,0 +1,33 @@
+package toml
+
+import (
+	"encoding"
+	"io"
+)
+
+// DEPRECATED!
+//
+// Use the identical encoding.TextMarshaler instead. It is defined here to
+// support Go 1.1 and older.
+type TextMarshaler encoding.TextMarshaler
+
+// DEPRECATED!
+//
+// Use the identical encoding.TextUnmarshaler instead. It is defined here to
+// support Go 1.1 and older.
+type TextUnmarshaler encoding.TextUnmarshaler
+
+// DEPRECATED!
+//
+// Use MetaData.PrimitiveDecode instead.
+func PrimitiveDecode(primValue Primitive, v interface{}) error {
+	md := MetaData{decoded: make(map[string]bool)}
+	return md.unify(primValue.undecoded, rvalue(v))
+}
+
+// DEPRECATED!
+//
+// Use NewDecoder(reader).Decode(&v) instead.
+func DecodeReader(r io.Reader, v interface{}) (MetaData, error) {
+	return NewDecoder(r).Decode(v)
+}