Added module "Future"

Note on Changes.md: The Digest::* modules were added in
haukex/emperl5@32197c61c8

Changes.md

@@ -8,6 +8,7 @@ not yet released: v0.09-beta
 
 - Added Perl.exitStatus
 - Updated regex_tester.html
+- Added modules Future, Digest::MD5, and Digest::SHA
 
 
 2018-09-04: v0.07-beta

build/emperl_config.sh

@@ -9,7 +9,7 @@
 
 # A whitespace-separated list of modules to download and add to the build.
 # Note: Cpanel::JSON::XS is required for WebPerl!
-export EMPERL_EXTENSIONS="Cpanel::JSON::XS Devel::StackTrace"
+export EMPERL_EXTENSIONS="Cpanel::JSON::XS Devel::StackTrace Future"
 
 # Modules from the above list that have XS code need to be linked statically.
 # Add them here, separated by whitespace (see also the "static_ext" variable