Improved wording in CHANGES.

CHANGES

@@ -9,7 +9,7 @@ Changes with Unit 1.0                                            12 Apr 2018
        header or body.
 
     *) Bugfix: Ruby applications that use encoding conversions might not
-       work.
+       have worked.
 
     *) Bugfix: various stability issues.
 
@@ -29,8 +29,8 @@ Changes with Unit 0.7                                            22 Mar 2018
     *) Bugfix: a segmentation fault occurred in Python module if
        start_response() was called outside of WSGI callable.
 
-    *) Bugfix: a segmentation fault might occur in PHP module if there was
-       an error while initialization.
+    *) Bugfix: a segmentation fault might have occurred in PHP module if
+       there was an error while initialization.
 
 
 Changes with Unit 0.6                                            09 Feb 2018
@@ -51,7 +51,7 @@ Changes with Unit 0.5                                            08 Feb 2018
 
     *) Bugfix: in reading client request body; the bug had appeared in 0.3.
 
-    *) Bugfix: some Python applications might not work due to missing
+    *) Bugfix: some Python applications might not have worked due to missing
        "wsgi.errors" environ variable.
 
     *) Bugfix: HTTP chunked responses might be encoded incorrectly on 32-bit
@@ -74,8 +74,8 @@ Changes with Unit 0.4                                            15 Jan 2018
     *) Bugfix: HTTP large header buffers allocation and deallocation fixed;
        the bug had appeared in 0.3.
 
-    *) Bugfix: some PHP applications might not work with relative "root"
-       path.
+    *) Bugfix: some PHP applications might not have worked with relative
+       "root" path.
 
 
 Changes with Unit 0.3                                            28 Dec 2017

docs/changes.xml

@@ -48,7 +48,7 @@ basic access logging.
 
 <change type="bugfix">
 <para>
-Ruby applications that use encoding conversions might not work.
+Ruby applications that use encoding conversions might not have worked.
 </para>
 </change>
 
@@ -129,8 +129,8 @@ outside of WSGI callable.
 
 <change type="bugfix">
 <para>
-a segmentation fault might occur in PHP module if there was an error while
-initialization.
+a segmentation fault might have occurred in PHP module if there was an error
+while initialization.
 </para>
 </change>
 
@@ -231,7 +231,7 @@ in reading client request body; the bug had appeared in 0.3.
 
 <change type="bugfix">
 <para>
-some Python applications might not work due to missing
+some Python applications might not have worked due to missing
 "wsgi.errors" environ variable.
 </para>
 </change>
@@ -307,7 +307,7 @@ the bug had appeared in 0.3.
 
 <change type="bugfix">
 <para>
-some PHP applications might not work with relative "root" path.
+some PHP applications might not have worked with relative "root" path.
 </para>
 </change>