Update release notes 1.9.7 to 1.9.21

Add hint: "As of AspectJ 1.9.21.1, '--add-opens' is no longer necessary.
Please upgrade, if it bothers you too much."

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

docs/release/README-1.9.19.adoc

@@ -77,6 +77,8 @@ the JVM parameter `--add-opens java.base/java.lang=ALL-UNNAMED` in order to enab
 fact that the weaver uses internal APIs for which we have not found an adequate replacement yet when defining classes
 in different classloaders.
 
+**Update:** As of AspectJ 1.9.21.1, `--add-opens` is no longer necessary. Please upgrade, if it bothers you too much.
+
 === Compile with Java preview features
 
 For features marked as preview on a given JDK, you need to compile with `ajc --enable-preview` and run with

docs/release/README-1.9.20.adoc

@@ -103,6 +103,8 @@ the JVM parameter `--add-opens java.base/java.lang=ALL-UNNAMED` in order to enab
 fact that the weaver uses internal APIs for which we have not found an adequate replacement yet when defining classes
 in different classloaders.
 
+**Update:** As of AspectJ 1.9.21.1, `--add-opens` is no longer necessary. Please upgrade, if it bothers you too much.
+
 === Compile with Java preview features
 
 For features marked as preview on a given JDK, you need to compile with `ajc --enable-preview` and run with

docs/release/README-1.9.21.adoc

@@ -165,6 +165,8 @@ JEPs. Therefore, you need to set the JVM parameter `--add-opens java.base/java.l
 aspect weaving. This is due to the fact that the weaver uses internal APIs for which we have not found an adequate
 replacement yet when defining classes in different classloaders.
 
+**Update:** As of AspectJ 1.9.21.1, `--add-opens` is no longer necessary. Please upgrade, if it bothers you too much.
+
 === Compile with Java preview features
 
 For features marked as preview on a given JDK, you need to compile with `ajc --enable-preview` and run with

docs/release/README-1.9.7.adoc

@@ -60,6 +60,8 @@ order to enable aspect weaving. This is due to the fact that the weaver
 uses internal APIs for which we have not found an adequate replacement
 yet when defining classes in different classloaders.
 
+**Update:** As of AspectJ 1.9.21.1, `--add-opens` is no longer necessary. Please upgrade, if it bothers you too much.
+
 == Organisational and internal changes
 
 For AspectJ 1.9.7, we implemented a lot of internal changes concerning

docs/release/README-1.9.8.adoc

@@ -75,6 +75,8 @@ the JVM parameter `--add-opens java.base/java.lang=ALL-UNNAMED` in order to enab
 fact that the weaver uses internal APIs for which we have not found an adequate replacement yet when defining classes
 in different classloaders.
 
+**Update:** As of AspectJ 1.9.21.1, `--add-opens` is no longer necessary. Please upgrade, if it bothers you too much.
+
 === Compile with Java preview features
 
 For features marked as preview on a given JDK, you need to compile with `ajc --enable-preview` and run with

docs/release/README-1.9.9.adoc

@@ -88,6 +88,8 @@ the JVM parameter `--add-opens java.base/java.lang=ALL-UNNAMED` in order to enab
 fact that the weaver uses internal APIs for which we have not found an adequate replacement yet when defining classes
 in different classloaders.
 
+**Update:** As of AspectJ 1.9.21.1, `--add-opens` is no longer necessary. Please upgrade, if it bothers you too much.
+
 === Compile with Java preview features
 
 For features marked as preview on a given JDK, you need to compile with `ajc --enable-preview` and run with