Fix Pushiko version substituion in FCM docs (#89)

Author: kennethshackleton

.github/workflows/publish-documentation.yml

@@ -46,5 +46,5 @@ jobs:
           git fetch origin gh-pages:gh-pages
           sed -i 's/<year>/${{ env.YEAR }}/g' docs/*.md
           sed -i 's/<year>/${{ env.YEAR }}/g' mkdocs.yml
-          sed -i 's/<pushikoVersion>/${{ env.VERSION }}/g' docs/*.md
+          sed -i 's/{pushikoVersion}/${{ env.VERSION }}/g' docs/*.md
           mkdocs gh-deploy -m 'Automatic mkdocs deployment.'

docs/getting_started_apns.md

@@ -11,7 +11,7 @@ First add Pushiko as a dependency.
     }
 
     dependencies {
-        implementation("com.bloomberg.pushiko:pushiko-apns:<pushikoVersion>")
+        implementation("com.bloomberg.pushiko:pushiko-apns:{pushikoVersion}")
     }
     ```
 
@@ -22,7 +22,7 @@ First add Pushiko as a dependency.
     }
 
     dependencies {
-        implementation 'com.bloomberg.pushiko:pushiko-apns:<pushikoVersion>'
+        implementation 'com.bloomberg.pushiko:pushiko-apns:{pushikoVersion}'
     }
     ```