Remove redundant snippets

These should be and are autocompleted and do not provide better value
over standard autocompletions.

Author: Xanewok

README.md

@@ -73,10 +73,6 @@ You can move to the next 'hole' in the template by pressing 'tab'. We provide
 the following snippets:
 
 * `for` - a for loop
-* `unimplemented`
-* `unreachable`
-* `print(ln)`
-* `assert(_eq)`
 * `macro_rules` - declare a macro
 * `if let Option` - an `if let` statement for executing code only in the `Some`
   case.

snippets/rust.json

@@ -15,48 +15,6 @@
         ],
         "description": "Insert for loop"
     },
-    "unimplemented": {
-        "prefix": "unimplemented",
-        "body": [
-            "unimplemented!()"
-        ],
-        "description": "Insert unimplemented!"
-    },
-    "unreachable": {
-        "prefix": "unreachable",
-        "body": [
-            "unreachable!()"
-        ],
-        "description": "Insert unreachable!"
-    },
-    "print": {
-        "prefix": "print",
-        "body": [
-            "print!(\"$1\", $2)$0"
-        ],
-        "description": "Insert print!"
-    },
-    "println": {
-        "prefix": "println",
-        "body": [
-            "println!(\"$1\", $2)$0"
-        ],
-        "description": "Insert println!"
-    },
-    "assert": {
-        "prefix": "assert",
-        "body": [
-            "assert!($1)$0"
-        ],
-        "description": "Insert assert!"
-    },
-    "assert_eq": {
-        "prefix": "assert_eq",
-        "body": [
-            "assert_eq!($1, $2)$0"
-        ],
-        "description": "Insert assert_eq!"
-    },
     "macro_rules": {
         "prefix": "macro_rules",
         "body": [