Merge pull request #2493 from CyberShadow/pull-20181023-154944

Add changelog clarifications from forum
merged-on-behalf-of: Jacob Carlborg <jacob-carlborg@users.noreply.github.com>

Author: dlang-bot

changelog/2.083.0_pre.dd

@@ -57,6 +57,11 @@ $(UL
  $(LI `CppRuntime_Sun`)
 )
 )
+
+$(P
+The C++ runtime in use generally depends on the C++ compiler used to build the C++ code that will be linked against.
+This is contrast to the C runtime, which generally depends on the target system.
+)
 )
 
 $(LI $(LNAME2 deprecated_switch_gc,Deprecated CLI switch `-gc` have been removed)
@@ -254,7 +259,12 @@ buildOptions "betterC"
 $(LI $(LNAME2 env_var_package_version,Environment variable DUB_PACKAGE_VERSION added)
 $(CHANGELOG_SOURCE_FILE dub, changelog/env_var_package_version.dd)
 $(P
-DUB now supports the environment variable DUB_PACKAGE_VERSION containing the version of the package
+When executing external commands, DUB will now set the environment variable `DUB_PACKAGE_VERSION`.
+The variable will contain the version of the package being built, as it appears in the output of `dub describe`.
+)
+$(P
+One application of this addition is to use a pre-build command to save the package version to a source file,
+in order to compile the version string into the application being built.
 )
 )