fix #8 : add dot to pre release versions

entrypoint.sh

@@ -26,7 +26,7 @@ main() {
   major=0; minor=0; patch=0; pre=""; preversion=0
 
   # break down the version number into it's components
-  regex="^([0-9]+).([0-9]+).([0-9]+)((-[a-z]+)([0-9]+))?$"
+  regex="^([0-9]+).([0-9]+).([0-9]+)((-[a-z]+).?([0-9]+))?$"
   if [[ $prev_version =~ $regex ]]; then
     major="${BASH_REMATCH[1]}"
     minor="${BASH_REMATCH[2]}"
@@ -57,7 +57,7 @@ main() {
           else ((++preversion))
         fi
     fi
-    pre="-alpha$preversion";;
+    pre="-alpha.$preversion";;
   "beta")
     if [[ -z "$preversion" ]];
       then
@@ -69,7 +69,7 @@ main() {
           else ((++preversion))
         fi
     fi
-    pre="-beta$preversion";;
+    pre="-beta.$preversion";;
   "rc")
     if [[ -z "$preversion" ]];
       then
@@ -81,7 +81,7 @@ main() {
           else ((++preversion))
         fi
     fi
-    pre="-rc$preversion";;
+    pre="-rc.$preversion";;
   esac
 
   next_version="${major}.${minor}.${patch}${pre}"