[LyX/master] Update Python requirement in INSTALL

[Scott Kostyshak]

commit 963fad692965081bee7533904f86376d85340a97
Author: Scott Kostyshak <skostysh at lyx.org>
Date:   Sun Feb 7 22:13:23 2021 -0500

    Update Python requirement in INSTALL
    
    Consistent with 92345167.
---
 INSTALL |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/INSTALL b/INSTALL
index 2847ad8..f26fba6 100644
--- a/INSTALL
+++ b/INSTALL
@@ -84,11 +84,10 @@ compile LyX with up-to-date translations (at least gettext version
 
 The two following programs should be available at configuration time:
 
-  o Python 2.7 must be installed. Python is used for many simple tasks
-    that are executed by external scripts, such as the automatic
-    configuration step and the import of older LyX documents with the
-    lyx2lyx script (this script is called automatically when opening a
-    file). Python 3 (3.3 or later) support is work in progress.
+  o Python (2.7 or 3.5 and newer) must be installed. Python is used for many
+    simple tasks that are executed by external scripts, such as the automatic
+    configuration step and the import of older LyX documents with the lyx2lyx
+    script (this script is called automatically when opening a file).
 
 
 Creating the Makefile