[gjs/mozjs78: 21/21] Update style guide for C++17.

[Evan Welsh <ewlsh src gnome org>]

commit f845115398917624218110ba4e38d90f48e3df64
Author: Evan Welsh <noreply evanwelsh com>
Date:   Sat Jul 4 22:30:39 2020 -0500

    Update style guide for C++17.

 doc/CPP_Style_Guide.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/doc/CPP_Style_Guide.md b/doc/CPP_Style_Guide.md
index 5d75c420..beac17d5 100644
--- a/doc/CPP_Style_Guide.md
+++ b/doc/CPP_Style_Guide.md
@@ -46,12 +46,12 @@ portable C++ code as the implementation language of choice.
 
 ### C++ Standard Versions ###
 
-GJS is currently written using C++14 conforming code, although we
+GJS is currently written using C++17 conforming code, although we
 restrict ourselves to features which are available in the major
 toolchains.
 
 Regardless of the supported features, code is expected to (when
-reasonable) be standard, portable, and modern C++14 code.
+reasonable) be standard, portable, and modern C++17 code.
 We avoid unnecessary vendor-specific extensions, etc., including
 `g_autoptr()` and friends.
 
@@ -65,9 +65,9 @@ and friends, for their type safety and memory management.
 There are some exceptions such as the standard I/O streams library which
 is avoided, and use in space-constrained situations.
 
-### Supported C++14 Language and Library Features ###
+### Supported C++17 Language and Library Features ###
 
-While GJS and SpiderMonkey use C++14, not all features are available in
+While GJS and SpiderMonkey use C++17, not all features are available in
 all of the toolchains which we support.
 A good rule of thumb is to check whether SpiderMonkey uses the feature.
 If so, it's okay to use in GJS.