set version to 2018.3 for several IDEs in 'master' branch

community-resources/src/idea/IdeaApplicationInfo.xml

 <component xmlns="http://jetbrains.org/intellij/schema/application-info"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://jetbrains.org/intellij/schema/application-info http://jetbrains.org/intellij/schema/ApplicationInfo.xsd">
-  <version major="2018" minor="2" eap="true"/>
+  <version major="2018" minor="3" eap="true"/>
   <company name="JetBrains s.r.o." url="https://www.jetbrains.com"/>
   <build number="__BUILD_NUMBER__" date="__BUILD_DATE__"/>
   <logo url="/idea_community_logo.png" textcolor="ffffff" progressColor="ffffff" progressX="117" progressY="280" progressHeight="3" />

python/python-community-ide-resources/resources/idea/PyCharmCoreApplicationInfo.xml

 <component xmlns="http://jetbrains.org/intellij/schema/application-info"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://jetbrains.org/intellij/schema/application-info http://jetbrains.org/intellij/schema/ApplicationInfo.xsd">
-  <version major="2018" minor="2" eap="true"/>
+  <version major="2018" minor="3" eap="true"/>
   <company name="JetBrains s.r.o." url="https://www.jetbrains.com" copyrightStart="2010"/>
   <build number="__BUILD_NUMBER__" date="__BUILD_DATE__"/>
   <logo url="/pycharm_core_logo.png" textcolor="ffffff" progressColor="ffffff" progressX="114" progressY="278" progressHeight="3"/>