[RELEASE] Released version 2.0.4

Released version 2.0.4 with the following main changes :
    - BUG/MEDIUM: protocols: add a global lock for the init/deinit stuff
    - BUG/MINOR: proxy: always lock stop_proxy()
    - BUILD: threads: add the definition of PROTO_LOCK
    - BUG/MEDIUM: lb-chash: Fix the realloc() when the number of nodes is increased
    - BUG/MEDIUM: streams: Don't switch the SI to SI_ST_DIS if we have data to send.
    - BUG/MINOR: log: make sure writev() is not interrupted on a file output
    - DOC: improve the wording in CONTRIBUTING about how to document a bug fix
    - BUG/MINOR: hlua/htx: Reset channels analyzers when txn:done() is called
    - BUG/MEDIUM: hlua: Check the calling direction in lua functions of the HTTP class
    - MINOR: hlua: Don't set request analyzers on response channel for lua actions
    - MINOR: hlua: Add a flag on the lua txn to know in which context it can be used
    - BUG/MINOR: hlua: Only execute functions of HTTP class if the txn is HTTP ready
    - BUG/MINOR: htx: Fix free space addresses calculation during a block expansion
    - BUG/MAJOR: queue/threads: avoid an AB/BA locking issue in process_srv_queue()
    - BUG/MINOR: debug: fix a small race in the thread dumping code
    - MINOR: wdt: also consider that waiting in the thread dumper is normal
    - BUG/MEDIUM: lb-chash: Ensure the tree integrity when server weight is increased
    - BUG/MAJOR: http/sample: use a static buffer for raw -> htx conversion
    - BUG/MINOR: stream-int: also update analysers timeouts on activity
    - BUG/MEDIUM: mux-h2: unbreak receipt of large DATA frames
    - BUG/MEDIUM: mux-h2: split the stream's and connection's window sizes
    - BUG/MEDIUM: proxy: Make sure to destroy the stream on upgrade from TCP to H2
    - BUG/MEDIUM: fd: Always reset the polled_mask bits in fd_dodelete().
    - BUG/MINOR: mux-h2: don't refrain from sending an RST_STREAM after another one
    - BUG/MINOR: mux-h2: use CANCEL, not STREAM_CLOSED in h2c_frt_handle_data()
    - BUG/MINOR: mux-h2: do not send REFUSED_STREAM on aborted uploads
    - BUG/MEDIUM: mux-h2: do not recheck a frame type after a state transition
    - BUG/MINOR: mux-h2: always send stream window update before connection's
    - BUG/MINOR: mux-h2: always reset rcvd_s when switching to a new frame
    - BUG/MEDIUM: checks: make sure to close nicely when we're the last to speak
diff --git a/doc/configuration.txt b/doc/configuration.txt
index ac3f24c..f5727b0 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -4,7 +4,7 @@
                          ----------------------
                               version 2.0
                              willy tarreau
-                              2019/07/23
+                              2019/08/06
 
 
 This document covers the configuration language as implemented in the version