Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 688a1bd4f99cb856b067c7b38c02cdab27070865
  - Junit test class added for TemplateException.java

    Junit test class added for TemplateException.java

    Issue-ID: APPC-1372
    Change-Id: I94d97e4b173c51a34a0320f3e24761582fc39101
    Signed-off-by: Sudarshan Kumar <sudars19@in.ibm.com>
  - made changes to existing test case

    to increase code coverage

    Issue-ID: APPC-1086
    Change-Id: I72df9d78b439ff5d8b610d87a5295f5dce3fba59
    Signed-off-by: Sandeep J <sandeejh@in.ibm.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index b23f8d7..688a1bd 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit b23f8d7f714710ddf65f74654522ad5bae67964e
+Subproject commit 688a1bd4f99cb856b067c7b38c02cdab27070865