Update metadata

metadata.txt

@@ -2,7 +2,7 @@
 name=Geoscience
 qgisMinimumVersion=3.2
 description=Tools for Geoscience & Exploration
-version=1.12
+version=1.13
 author=Roland Hill
 [email protected]
 
@@ -15,7 +15,9 @@ repository=https://github.com/rolandhill/geoscience
 # Recommended items:
 
 # Uncomment the following line and add your changelog:
-changelog=1.12
+changelog=1.13
+    -Implement downhole point generator for tick marks
+  1.12
     -Fix last desurvey segment length calculation.
   1.11
     -Convert structure symbol size from spin box to line edit to fix error produced by changed API.