fix(Git): Ignore case in the log analyze ignores

```
# filterUpdateLog: $true|$false
#   When show_update_log is set and this option is set, only commits that changed the installed applications and new manifests additiona will be shown.
#   This will result into showing you only commits related to your used manifests and newly added manifests available for installation.
#
                $filter = get_config 'filterUpdateLog' $false
                if ($filter) {
                    $allInstalled = @(installed_apps $true, installed_apps $false) | Select-Object -Unique
                    $regex = "^((((^(($($allInstalled -join '|'))):\s*)))|(.*?: Add version)).*$" # Ignore everything, which is not installed
                    #$para += @("--grep=""$regex""")
                    $para += @('--grep="^(((.*?):\s*Add version)).*$"')
                }
```

lib/Git.ps1

@@ -54,9 +54,11 @@ function Invoke-GitCmd {
                 $para = @(
                     '--no-decorate'
                     '--format="tformat: * %C(yellow)%h%Creset %<|(72,trunc)%s %C(cyan)%cr%Creset"'
-                    '--grep="\[\(scoop\|shovel\) skip\]"' # Ignore [scoop skip] [shovel skip]
-                    '--grep="^Merge [cb]"' # Ignore merge commits
+                    '--regexp-ignore-case'
+                    '--extended-regexp'
                     '--invert-grep'
+                    '--grep="\[(scoop|shovel) skip\]"' # Ignore [scoop skip] [shovel skip]
+                    '--grep="^Merge [pcb]"' # Ignore merge commits
                 )
                 $Argument = $para + $Argument
             }