[ETCM-129] prepare for Scala 2.13 replace ⇒ to => #722
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Description
After switching to Scala 2.13 there are many errors. Fixing some is tricky. I want to start from the low-risk ones.
This PR fix errors caused by the usage of Unicode symbol ⇒
Proposed Solution
replace ⇒ to =>
Important Changes Introduced
Testing