use go-scalar, vendoring

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+[![GoDoc](https://godoc.org/github.com/alexflint/go-scalar?status.svg)](https://godoc.org/github.com/alexflint/go-scalar)
+[![Build Status](https://travis-ci.org/alexflint/go-scalar.svg?branch=master)](https://travis-ci.org/alexflint/go-scalar)
+[![Coverage Status](https://coveralls.io/repos/alexflint/go-scalar/badge.svg?branch=master&service=github)](https://coveralls.io/github/alexflint/go-scalar?branch=master)
+[![Report Card](https://goreportcard.com/badge/github.com/alexflint/go-scalar)](https://goreportcard.com/badge/github.com/alexflint/go-scalar)
+
+## Scalar parsing library
+
+Scalar is a library for parsing strings into arbitrary scalars (integers,
+floats, strings, booleans, etc). It is helpful for tasks such as parsing
+strings passed as environment variables or command line arguments.
+
+```shell
+go get github.com/alexflint/go-scalar
+```
+
+The main API works as follows:
+
+```go
+var value int
+err := scalar.Parse(&value, "123")
+```
+
+There is also a variant that takes a `reflect.Value`:
+
+```go
+var value int
+err := scalar.ParseValue(reflect.ValueOf(&value), "123")
+```