peg: Downgrade to latest stable version 0.1.19

Closes: https://trac.macports.org/ticket/70239

devel/peg/Portfile

@@ -4,8 +4,14 @@ PortSystem          1.0
 PortGroup           makefile 1.0
 
 name                peg
-version             0.1.20
+epoch               1
+# 0.1.20 is a development version subject to change and incompatible at present with ngs.
+# https://github.com/ngs-lang/ngs/issues/662
+version             0.1.19
 revision            0
+checksums           rmd160  e7962ebef366f96f7ab27b8c3aead7a78cd085e1 \
+                    sha256  0013dd83a6739778445a64bced3d74b9f50c07553f86ea43333ae5fab5c2bbb4 \
+                    size    136241
 
 homepage            https://www.piumarta.com/software/peg
 
@@ -30,10 +36,6 @@ license             MIT
 maintainers         {gmail.com:herby.gillot @herbygillot} \
                     openmaintainer
 
-checksums           rmd160  5f8afd1d713a9a491cbb655719984e3be6c9f3bf \
-                    sha256  b8b717bc93a59768a35d6525679a4e0ce94e6bf66f92bacf2979c6474572b45a \
-                    size    137305
-
 master_sites        ${homepage}
 
 patch {