Fix Properties.store(OutputStream os, String comment)

This fixes the store method taking an `OutputStream` by flushing and closing the writer created to wrap it.

pom.xml

@@ -187,4 +187,4 @@
             <url>https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/</url>
         </repository>
     </distributionManagement>
-</project>
+</project>

src/main/java/org/codejive/properties/Properties.java

@@ -910,7 +910,9 @@ public void store(Path file, String... comment) throws IOException {
      * @throws IOException Thrown when any IO error occurs during operation
      */
     public void store(OutputStream out, String... comment) throws IOException {
-        store(new OutputStreamWriter(out, StandardCharsets.ISO_8859_1), comment);
+        store(
+                new BufferedWriter(new OutputStreamWriter(out, StandardCharsets.ISO_8859_1)),
+                comment);
     }
 
     /**
@@ -938,6 +940,7 @@ public void store(Writer writer, String... comment) throws IOException {
             writer.write(pos.raw());
             pos.next();
         }
+        writer.flush();
     }
 
     /**

src/test/java/org/codejive/properties/TestProperties.java

@@ -118,6 +118,15 @@ void testStore() throws IOException, URISyntaxException {
         assertThat(sw.toString()).isEqualTo(readAll(f));
     }
 
+    @Test
+    void testStoreOutputStream() throws IOException, URISyntaxException {
+        Path f = getResource("/test-escaped.properties");
+        Properties p = Properties.loadProperties(f);
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        p.store(os);
+        assertThat(os.toString()).isEqualTo(readAll(f));
+    }
+
     @Test
     void testStoreCrLf() throws IOException, URISyntaxException {
         Path f = getResource("/testcrlf.properties");