Upgrade hcl to v2

Signed-off-by: Patrick Van Stee <patrick@vanstee.me>

vendor/github.com/zclconf/go-cty/cty/doc.go

@@ -0,0 +1,18 @@
+// Package cty (pronounced see-tie) provides some infrastructure for a type
+// system that might be useful for applications that need to represent
+// configuration values provided by the user whose types are not known
+// at compile time, particularly if the calling application also allows
+// such values to be used in expressions.
+//
+// The type system consists of primitive types Number, String and Bool, as
+// well as List and Map collection types and Object types that can have
+// arbitrarily-typed sets of attributes.
+//
+// A set of operations is defined on these types, which is accessible via
+// the wrapper struct Value, which annotates the raw, internal representation
+// of a value with its corresponding type.
+//
+// This package is oriented towards being a building block for configuration
+// languages used to bootstrap an application. It is not optimized for use
+// in tight loops where CPU time or memory pressure are a concern.
+package cty