Run tests with both Saxon 9.6.0-7 and 9.6.0-10 (expath#68)

* Saxon 9.6.0-7 is used because it is the version currently used in Oxygen
* Saxon 9.6.0-10 is used because it is the latest 9.6 version provided by Saxon
* Saxon 9.7.0-14 is used because it is the latest 9.7 version provided by Saxon

.travis.yml

@@ -1,6 +1,10 @@
 env:
     matrix:
+        # latest Saxon 9.7 version
         - SAXON_VERSION=9.7.0-14
+        # latest Saxon 9.6 version
+        - SAXON_VERSION=9.6.0-10
+        # Saxon version used in oXygen
         - SAXON_VERSION=9.6.0-7
 
 before_script:
@@ -10,7 +14,7 @@ before_script:
     - bash /tmp/bats/install.sh /tmp/local
     - export PATH=$PATH:/tmp/local/bin
     # install Saxon
-    - mkdir -p /tmp/xspec/saxon 
+    - mkdir -p /tmp/xspec/saxon
     - export SAXON_CP=/tmp/xspec/saxon/saxon9he.jar
     - wget -O ${SAXON_CP} http://central.maven.org/maven2/net/sf/saxon/Saxon-HE/${SAXON_VERSION}/Saxon-HE-${SAXON_VERSION}.jar
     - chmod +x ${SAXON_CP}

appveyor.yml

@@ -1,8 +1,13 @@
 environment:
   SAXON_CP: '%APPVEYOR_BUILD_FOLDER%\saxon\saxon9he.jar'
   matrix:
-  - SAXON_VER: 9.7.0-14
-  - SAXON_VER: 9.6.0-7
+    # latest Saxon 9.7 version
+    - SAXON_VER: 9.7.0-14
+    # latest Saxon 9.6 version
+    - SAXON_VER: 9.6.0-10
+    # Saxon version used in oXygen
+    - SAXON_VER: 9.6.0-7
+
 install:
 - ps: >-
     mkdir -Name "saxon"
@@ -29,4 +34,4 @@ test_script:
     rem execute XSpec unit tests
 
     test\run-xspec-tests.cmd
-deploy: off
+deploy: off