Use Tycho 1.1.0

Last builds for target Eclipse-4.8 (photon) are failed, because of
...
[ERROR] Cannot resolve target definition:
[ERROR]   Software being installed: org.eclipse.sdk.ide 4.8.0.I20180124-2000
[ERROR]   Missing requirement: org.eclipse.sdk.ide 4.8.0.I20180124-2000 requires 'config.a.jre.javase [9.0.0]' but it could not be found
[ERROR] 
[ERROR] Failed to resolve target definition /home/travis/build/anb0s/EasyShell/platform/Eclipse-4.8.target: See log for details -> [Help 1]
...
see:
https://travis-ci.org/anb0s/EasyShell/jobs/347975865
https://travis-ci.org/anb0s/EasyShell/jobs/347975867

Detailed description about the problem and solution: https://dev.eclipse.org/mhonarc/lists/cross-project-issues-dev/msg15210.html

Author: anb0s

pom.xml

@@ -19,7 +19,7 @@
 
   <properties>
     <new.version>2.1.1-SNAPSHOT</new.version>
-    <tycho.version>1.0.0</tycho.version>
+    <tycho.version>1.1.0</tycho.version>
     <target.platform>Eclipse-4.7</target.platform>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>