Fix MIT license for; tidy go.mod and create go.sum (#62)

Currently the documentation for is not displayed on because of license restrictions:

This is almost certainly because the License file includes an errant

    The MIT License (MIT)

The actual MIT license does not include this header:

GitHub and other interfaces surface the type of the license through
automatic detection (as will Hence this header is
superfluous in any case.

Whilst we are at it, tidy up go.mod and add go.sum.
diff --git a/License b/License
index 05c783c..480a328 100644
--- a/License
+++ b/License
@@ -1,5 +1,3 @@
-The MIT License (MIT)
 Copyright 2012 Keith Rarick
 Permission is hereby granted, free of charge, to any person obtaining a copy
diff --git a/go.mod b/go.mod
index 1e29533..9a27b6e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
-module ""
-require "" v0.1.0
+go 1.12
+require v0.1.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..714f82a
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,3 @@ v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE= v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=