GP-936: README.md and DevGuide.md now state that we support Gradle 5.x

and 6.x (instead of 5.0 and later)

DevGuide.md

@@ -34,7 +34,7 @@ You may not need all of these, depending on which portions you are building or d
       - https://adoptopenjdk.net/releases.html?variant=openjdk11&jvmVariant=hotspot
     - Amazon Corretto
       - https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/downloads-list.html
-* Gradle 5.0 or later - We use version 5.0, and tested with up to 6.8.3.
+* Gradle 5.x or 6.x - We use version 5.0, and have tested with up to 6.8.3.
     - https://gradle.org/next-steps/?version=5.0&format=bin
 * A C/C++ compiler - We use GCC on Linux, Xcode (Clang) on macOS, and Visual Studio (2017 or later) on Windows.
     - https://gcc.gnu.org/

README.md

@@ -38,7 +38,7 @@ To create the latest development build for your platform from this source reposi
 
 ##### Install build tools:
 * [JDK 11 64-bit][jdk11]
-* [Gradle][gradle] (minimum v5.0)
+* [Gradle][gradle] (version 5.x or 6.x)
 * make, gcc, and g++ (Linux/macOS-only)
 * [Microsoft Visual Studio][vs] (Windows-only)