Update Alpine Linux version in PLATFORMS file

Commit 76cfefe3fce06698339048d1d55d5a57b5ac75b1 updated PLATFORMS.md
file, but failed to update the plain-text PLATFORMS file.

diff --git a/PLATFORMS b/PLATFORMS
index e7c799b3f7ff2a71348dd8ff62596832449f1544..820a9f10638805259aeea0057f321b682098b949 100644 (file)
--- a/PLATFORMS
+++ b/PLATFORMS
@@ -43,7 +43,7 @@ following systems:
   * Red Hat Enterprise Linux / CentOS 7, 8
   * FreeBSD 11.4, 12.2
   * OpenBSD 6.8
-  * Alpine Linux 3.12
+  * Alpine Linux 3.13
 
 The amd64, i386, armhf and arm64 CPU architectures are all fully
 supported.