bash3.2 fix, warn people but support bash3.2

scripts/hooks.sh

@@ -47,7 +47,13 @@ __resh_collect() {
         local __RESH_PID="$$" # current pid
     elif [ -n "$BASH_VERSION" ]; then
         # assume Bash
+        if [ "${BASH_VERSINFO[0]}" -ge "4" ]; then
+            # $BASHPID is only available in bash4+
+            # $$ is fairly similar so it should not be an issue
             local __RESH_PID="$BASHPID" # current pid
+        else
+            local __RESH_PID="$$" # current pid
+        fi
     fi
     # time
     local __RESH_TZ_BEFORE; __RESH_TZ_BEFORE=$(date +%z)

scripts/install.sh

@@ -27,7 +27,7 @@ elif [ "$bash_version_major" -eq 4 ] && [ "$bash_version_minor" -lt 3 ]; then
 fi
 
 if [ "$bash_too_old" = true ]; then
-    echo " * Bash version: $bash_version - UNSUPPORTED!"
+    echo " * Bash version: $bash_version"
     if [ "$login_shell" = bash ]; then
         echo "   > Your bash version is old."
         echo "   > Bash is also your login shell."