update help message

HOWTO.md

@@ -64,7 +64,7 @@ Here is an example of possible `.gitlab-ci.yml`:
 pages:
   image: alpine
   script:
-    - wget -c https://github.com/kpym/gm/releases/download/v0.17.0/gm_0.17.0_Linux_64bit.tar.gz -O - | tar -C /usr/local/bin -xz gm
+    - wget -c https://github.com/kpym/gm/releases/download/v0.17.1/gm_0.17.1_Linux_64bit.tar.gz -O - | tar -C /usr/local/bin -xz gm
     - gm --pages '**/*'
   artifacts:
     paths:

README.md

@@ -23,13 +23,14 @@ This tool is a thin wrapper around the [github.com/yuin/goldmark](https://github
 
 ```
 > gm -h
-gm (version: 0.17.0): a goldmark cli tool which is a thin wrapper around github.com/yuin/goldmark (versio: v1.5.6).
+gm (version: 0.17.1): a goldmark cli tool which is a thin wrapper around github.com/yuin/goldmark (versio: v1.5.6).
 
   If not serving (no '--serve' or '-s' option is used):
   - the .md files are converted and saved as .html with the same base name;
-  - if the .html file exists it is overwritten;
+  - if the corresponding .html file already exists, it is overwritten;
   - 'stdin' is converted to 'stdout';
   - when a pattern is used, only the matched .md files are considered.
+  - the pattern can contain '*', '?', the '**' glob pattern, '[class]' and {alt1,...} alternatives.
 
   When serving (with '--serve' or '-s' option):
   - the .md files are converted and served as html with live.js (for live updates);

gm_parameters.go

@@ -30,9 +30,10 @@ func help() {
 
   If not serving (no '--serve' or '-s' option is used):
   - the .md files are converted and saved as .html with the same base name;
-  - if the .html file exists it is overwritten;
+  - if the corresponding .html file already exists, it is overwritten;
   - 'stdin' is converted to 'stdout';
   - when a pattern is used, only the matched .md files are considered.
+  - the pattern can contain '*', '?', the '**' glob pattern, '[class]' and {alt1,...} alternatives.
 
   When serving (with '--serve' or '-s' option):
   - the .md files are converted and served as html with live.js (for live updates);