Update NEWS file

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+Version 0.6.0
+
+  * C++ Modules TS support for GCC, Clang, and VC.
+
+    The new 'experimental' value of the cxx.std variable enables modules
+    support if provided by the C++ compiler. The cxx.features.modules boolean
+    variable can be used to control/query C++ modules enablement.
+
+    See the "C++ Module Support" section in the build system manual for all
+    the details.
+
+  * Precise change detection for C and C++ sources.
+
+    The build system now calculates a checksum of the preprocessed token
+    stream and avoids recompilation if the changes are ignorable (whitespaces,
+    comments, unused macros, etc). To minimize confusion ("I've changed my
+    code but nothing got updated"), the build system prints a 'skip' line for
+    ignored changes.
+
+  * Initial support for utility libraries.
+
+    A utility librart is an archive that "mimics" the object file type
+    (executable, static library, or shared library) of its "primary" target.
+    Unless explicitly overridden, utility libraries are linked in the "whole
+    archive" mode. For example:
+
+    exe{prog}: cxx{prog} libu{prog}
+    libu{prog}: cxx{* -prog} libu{prog}
+
+    # Unit tests.
+    #
+    tests/
+    {
+      libu{*}: bin.whole = false # Don't link whole.
+
+      exe{test1}: cxx{test1} ../libu{prog}
+      exe{test2}: cxx{test2} ../libu{prog}
+    }
+
+    This change adds the new target group libu{} and its libue{}, libua{}, and
+    libus{} members. Note that the bin.whole variable can also be used on
+    normal static libraries.
+
+  * Progress display.
+
+    The build system will now display build progress for low verbosity levels
+    and if printing to a terminal. It can also be explicitly requested with
+    the -p|--progress option and suppressed with --no-progress.
+
+    Note that it is safe to enable progress even when redirecting to a file,
+    for example:
+
+    b -p 2>&1 | tee build.log
+
+  * Support for generating pkg-config's .pc files on install.
+
+    These files are now generated by default and automatically for libraries
+    being installed provided the version, project.summary, and project.url
+    variables are defined. The version module has been improved to extract the
+    summary and url in addition to version from the manifest.
+
+  * Support for the '20' cxx.std value (C++20/c++2a).
+
+  * The fail, warn, info, and text directives in addition to print. For
+    example:
+
+    if ($cxx.id.type == 'msvc')
+      fail 'msvc is not supported'
+
+  * New build system functions:
+
+    - $getenv()                         -- query environment variable value
+    - $filesystem.path_{search,match}() -- wildcard pattern search/match
+    - $regex.{match,search,replace}()   -- regex match/search/replace
+
+  * New Testscript builtins:
+
+    - ln
+    - exit (pseudo-builtin)
+
+  * Separate C and C++ (partial) preprocessing and compilation for Clang, GCC,
+    and VC.
+
+    This is part of the infrastructure that is relied upon by the C++ modules
+    support, precise change detection support, and, in the future, by
+    distributed compilation.
+
+    There is also the ability to limit the amount of preprocessing done on a
+    source file by setting the {c,cxx}.preprocessed variables. Valid values
+    are 'none' (not preprocessed), 'includes' (no #include directives in the
+    source), 'modules' (as above plus no module declarations depend on the
+    preprocessor, for example, #ifdef, etc.), and 'all' (the source is fully
+    preprocessed). Note that for 'all' the source may still contain comments
+    and line continuations.
+
+    While normally unnecessary, the use of the (partially) preprocessed output
+    in compilation can be disabled. This can be done from a buildfile for a
+    scope (including project root scope) and per target via the cc.reprocess
+    variable:
+
+    cc.reprocess = true
+    obj{hello}: cc.reprocess = false
+
+    As as well externally via the config.cc.reprocess variable:
+
+    b config.cc.reprocess=true
+
 Version 0.5.0
 
   * Parallel build system execution, including header dependency extraction