travis: Add linter for lexical illusions (duplicate words) (#64)

.travis.yml

@@ -14,4 +14,5 @@ script:
   - git grep ' $' -- "*.asciidoc" "*.md" && echo "^ Trailing space detected at end of line. Please remove." && exit 1 || true
   - git grep $'\t' -- "*.asciidoc" "*.md" && echo "^ Use of tabs detected. Please use space for indentation." && exit 1 || true
   - git grep "[^ ]  [^ ]" -- "*.asciidoc" "*.md" && echo "^ Satoshi style double spacing detected. Sorry Satoshi, please use single spacing." && exit 1 || true
+  - git grep -iE '(^| )(\w+) \2(\.|,|:|;| |$)' -- "*.asciidoc" "*.md" && echo "^ Detected lexical illusion in the form of a duplicated word. Please correct." && exit 1 || true
   - codespell --ignore-words-list=que $(git ls-files -- "*.asciidoc" "*.md")

glossary.asciidoc

@@ -233,7 +233,7 @@ Locktime::
 
 Millisatoshi::
     The smallest unit of account on the lightning network.
-    The the value cannot be enforced on chain.
+    The value cannot be enforced on chain.
 
 multisignature::
     Multisignature (multisig) refers to requiring more than one key to authorize a bitcoin transaction.

topics.asciidoc

@@ -88,7 +88,7 @@ While also important for end users to be aware of some of the topics here it is
 * backup & restore a Lightning Network node
 * configure a Lightning network Node
 ** max concurrent htlc in flight
-** min channel channel size
+** min channel size
 ** max channel size
 ** cltv_expiry delta
 ** routing fees