Re-license as MIT (#2334)

Co-authored-by: Jim Hester <james.f.hester@gmail.com>

Author: hadley

.Rbuildignore

@@ -16,3 +16,4 @@
 ^script\.R$
 ^pkgdown$
 ^man-roxygen$
+^LICENSE\.md$

DESCRIPTION

@@ -13,12 +13,9 @@ Authors@R:
              family = "Chang",
              role = "aut"),
       person(given = "RStudio",
-             role = c("cph", "fnd")),
-      person(given = "R Core team",
-             role = "ctb",
-             comment = "Some namespace and vignette code extracted from base R"))
+             role = c("cph", "fnd"))
 Description: Collection of package development tools.
-License: GPL (>= 2)
+License: MIT + file LICENSE
 URL: https://devtools.r-lib.org/, https://github.com/r-lib/devtools
 BugReports: https://github.com/r-lib/devtools/issues
 Depends: 

LICENSE

@@ -0,0 +1,2 @@
+YEAR: 2021
+COPYRIGHT HOLDER: devtools authors

LICENSE.md

@@ -0,0 +1,21 @@
+# MIT License
+
+Copyright (c) 2021 devtools authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.