updated to current opam-2.0.3, which is also the version provided by Cygwin 3.0.4;

--- a/Admin/components/components.sha1	Wed Mar 20 23:06:51 2019 +0100
+++ b/Admin/components/components.sha1	Thu Mar 21 12:38:06 2019 +0100
@@ -168,6 +168,7 @@
 26df569cee9c2fd91b9ac06714afd43f3b37a1dd  nunchaku-0.3.tar.gz
 e573f2cbb57eb7b813ed5908753cfe2cb41033ca  nunchaku-0.5.tar.gz
 fe57793aca175336deea4f5e9c0d949a197850ac  opam-1.2.2.tar.gz
+002f74c9e65e650de2638bf54d7b012b8de76c28  opam-2.0.3.tar.gz
 1c8cb6a8f4cbeaedce2d6d1ba8fc7e2ab3663aeb  polyml-5.4.1.tar.gz
 a3f9c159a0ee9a63b7a5d0c835ed9c2c908f8b56  polyml-5.5.0-1.tar.gz
 7d604a99355efbfc1459d80db3279ffa7ade3e39  polyml-5.5.0-2.tar.gz

--- a/Admin/components/main	Wed Mar 20 23:06:51 2019 +0100
+++ b/Admin/components/main	Thu Mar 21 12:38:06 2019 +0100
@@ -11,7 +11,7 @@
 jortho-1.0-2
 kodkodi-1.5.2-1
 nunchaku-0.5
-opam-1.2.2
+opam-2.0.3
 polyml-5.8
 postgresql-42.2.5
 scala-2.12.8

--- a/Admin/ocaml/opam/README	Wed Mar 20 23:06:51 2019 +0100
+++ b/Admin/ocaml/opam/README	Thu Mar 21 12:38:06 2019 +0100
@@ -1,10 +1,10 @@
-This is OPAM 1.2.2 -- the OCaml Package Manager.
+This is OPAM 2.0.3 -- the OCaml Package Manager.
 
 The executables for x86_64-linux and x86_64-darwin are from
-https://github.com/ocaml/opam/releases/tag/1.2.2
+https://github.com/ocaml/opam/releases/tag/2.0.3
 
 The executable for x86_64-cygwin is provided as a Cygwin package.
 
 
     Makarius
-    08-Oct-2018
+    21-Mar-2018