patch 8.1.0137: CI does not run with TCL

Problem:    CI does not run with TCL.
Solution:   Add TCL to the travis config. (Dominique Pelle, closes #3133)
diff --git a/.travis.yml b/.travis.yml
index 60e7604..4485cc9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,18 +11,18 @@
 
 env:
   - BUILD=yes TEST=scripttests COVERAGE=yes CFLAGS=--coverage LDFLAGS=--coverage FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
-    "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-python3interp --enable-rubyinterp --enable-luainterp'"
+    "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-python3interp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
   - BUILD=no TEST=unittests COVERAGE=yes CFLAGS=--coverage LDFLAGS=--coverage FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=yes
   - BUILD=yes TEST=test COVERAGE=no FEATURES=normal CONFOPT= SHADOWOPT="-C src/shadow" SRCDIR=./src/shadow CHECK_AUTOCONF=no
   - BUILD=yes TEST=test COVERAGE=no FEATURES=small CONFOPT= SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
   - BUILD=yes TEST=test COVERAGE=no FEATURES=tiny  CONFOPT= SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
     # Mac OSX build
   - BUILD=yes TEST=test COVERAGE=no FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
-    "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp'"
+    "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
     # ASAN build
   - BUILD=yes TEST=test SANITIZER_CFLAGS="-g -O1 -DABORT_ON_INTERNAL_ERROR -DEXITFREE -fsanitize=address -fno-omit-frame-pointer"
     FEATURES=huge SRCDIR=./src CHECK_AUTOCONF=no ASAN_OPTIONS="print_stacktrace=1 log_path=asan" LSAN_OPTIONS="suppressions=$TRAVIS_BUILD_DIR/src/testdir/lsan-suppress.txt"
-    "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp'"
+    "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
 
 sudo: false
 
@@ -39,16 +39,16 @@
       env: BUILD=yes TEST=test COVERAGE=no FEATURES=small CONFOPT= SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
     - os: osx
       env: BUILD=yes TEST=scripttests COVERAGE=yes CFLAGS=--coverage LDFLAGS=--coverage FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
-            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-python3interp --enable-rubyinterp --enable-luainterp'"
+            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-python3interp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
     - os: osx
       env: BUILD=yes TEST=test SANITIZER_CFLAGS="-g -O1 -DABORT_ON_INTERNAL_ERROR -DEXITFREE -fsanitize=address -fno-omit-frame-pointer"
             FEATURES=huge SRCDIR=./src CHECK_AUTOCONF=no ASAN_OPTIONS="print_stacktrace=1 log_path=asan" LSAN_OPTIONS="suppressions=$TRAVIS_BUILD_DIR/src/testdir/lsan-suppress.txt"
-            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp'"
+            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
     - os: linux
       compiler: clang
       env: BUILD=yes TEST=test SANITIZER_CFLAGS="-g -O1 -DABORT_ON_INTERNAL_ERROR -DEXITFREE -fsanitize=address -fno-omit-frame-pointer"
             FEATURES=huge SRCDIR=./src CHECK_AUTOCONF=no ASAN_OPTIONS="print_stacktrace=1 log_path=asan" LSAN_OPTIONS="suppressions=$TRAVIS_BUILD_DIR/src/testdir/lsan-suppress.txt"
-            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp'"
+            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
     - os: linux
       compiler: clang
       env: BUILD=no TEST=unittests COVERAGE=yes CFLAGS=--coverage LDFLAGS=--coverage FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=yes
@@ -57,7 +57,7 @@
       env: BUILD=yes TEST=test COVERAGE=no FEATURES=small CONFOPT= SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
     - os: linux
       env: BUILD=yes TEST=test COVERAGE=no FEATURES=huge SHADOWOPT= SRCDIR=./src CHECK_AUTOCONF=no
-            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp'"
+            "CONFOPT='--enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-luainterp --enable-tclinterp'"
 
 branches:
   except:
@@ -75,6 +75,7 @@
       - liblua5.2-dev
       - lua5.2
       - ruby-dev
+      - tcl-dev
       - cscope
       - libgtk2.0-dev
 
diff --git a/src/version.c b/src/version.c
index 4e88163..9c79148 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    137,
+/**/
     136,
 /**/
     135,