Update CHANGES file with recent news.

CHANGES

@@ -1,5 +1,29 @@
 ??.??.2022: Rhialto
-        version 0.?.?:
+        version 0.8:
+        - Improve parsing of symbols, e.g. `4..` is not a symbol.
+        - More careful file format checking of .MLB files, so that you can
+          use either RSX or RT format .MLB files, and autodetection works.
+        - Replace the floating point parser by a version which is based on
+          integer math only, because the Apple M1 doesn't have the required
+          long double support in its compiler.
+        11 changes from Paul Koning that add some features which help to
+        assemble RSTS/E sources:
+        - Add default extensions to .include, .library
+        - Fix .psect without argument, add (ignored) pseudo ops .mdelete,
+          .cross, .nocross
+        - Allow TRAP without argument, or with non-literal argument
+        - Fix .library pseudo
+        - Always list lines that have an error
+        - Fix macro calls with omitted argument that has a default value,
+          followed by additional (not omitted) arguments.
+        - Implement .ENABLE MCL
+        - Treat unexpected .IF argument as true, not false.  This appears to
+          be what the reference assembler does, at least it is necessary for
+          certain RSTS source files to assemble without error.
+        - Allow explicit decimal point after .RADIX argument.
+        - Allow formal name of .IRP and .IRPC to be enclosed in < >.
+        - Just like .RAD50, .IDENT accepts an argument that can contain not
+          just delimited string characters but also values in < >.
 
 05.01.2022: Rhialto
         version 0.7.2: