Doc: Support Clang 7+

For `<variant>`, clang 6 is not to be recommended for C++17 compilation unless by expert users that know how to change the stdlib. Thus, let's only recommend Clang 7+. Ubuntu 18.04 (bionic/oldstable) ships clang 6 by default, but Ubuntu 20.04 (focal/stable) is already at clang 10.
openPMD · Jan 20, 2022 · e1f7d9e · e1f7d9e
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diff --git a/README.md b/README.md
@@ -100,7 +100,7 @@ Our manual shows full [read & write examples](https://openpmd-api.readthedocs.io
 
 Required:
 * CMake 3.15.0+
-* C++17 capable compiler, e.g., g++ 7+, clang 6+, MSVC 19.15+, icpc 19+, icpx
+* C++17 capable compiler, e.g., g++ 7+, clang 7+, MSVC 19.15+, icpc 19+, icpx
 
 Shipped internally in `share/openPMD/thirdParty/`:
 * [Catch2](https://github.com/catchorg/Catch2) 2.13.4+ ([BSL-1.0](https://github.com/catchorg/Catch2/blob/master/LICENSE.txt))

diff --git a/docs/source/dev/dependencies.rst b/docs/source/dev/dependencies.rst
@@ -10,7 +10,7 @@ Required
 --------
 
 * CMake 3.15.0+
-* C++17 capable compiler, e.g., g++ 7+, clang 6+, MSVC 19.15+, icpc 19+, icpx
+* C++17 capable compiler, e.g., g++ 7+, clang 7+, MSVC 19.15+, icpc 19+, icpx
 
 Shipped internally
 ------------------