Updated compiler support in README

Author: rollbear

README.md

@@ -151,8 +151,8 @@ users.) Feel free to add your name to the copyright blurb.
 
 Trompeloeil is known to work with:
 
-- GCC [4.8.4](docs/Backward.md#gxx48x_limitations)+, 4.9.3+, 5, 6, 7, 8, 9, 10, 11, 12
-- Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
+- GCC [4.8.4](docs/Backward.md#gxx48x_limitations)+, 4.9.3+, 5, 6, 7, 8, 9, 10, 11, 12, 13
+- Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
 - Visual Studio 2015, 2017, 2019
 
 Latest patch level releases are assumed in the versions listed above.